Article
Chemistry, Multidisciplinary
Peng Chen, Shun-Zhong Tan, Lei Zhu, Qin Ouyang, Zhi-Jun Jia, Wei Du, Ying-Chun Chen
Summary: In this study, a Pd-0 catalyst mediated the regio- and enantioselective aza-Morita-Baylis-Hillman (MBH) reaction of α,β,γ,δ-unsaturated systems by using a δ-Lewis base as the catalyst. The reaction involved the dehydrogenative reaction of γ,δ-unsaturated compounds to produce electron-poor dienes, which then underwent regioselective umpolung Friedel-Crafts-type addition to imines through the auto-tandem Pd-0-π-Lewis base catalysis. After β-H elimination, chemically inverse aza-MBH-type adducts with excellent enantioselectivity were obtained.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Organic
Jianning Liao, Jipan Dong, Jiaqing Xu, Wei Wang, Yongjun Wu, Yuxia Hou, Hongchao Guo
Summary: A phosphine-catalyzed [3 + 2] annulation reaction has been developed in this study to synthesize multifunctional isoxazoles with moderate to good yields and diastereoselectivities. The use of a spirocyclic chiral phosphine catalyst resulted in up to 89% ee.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Organic
Naruhiro Gondo, Koki Fujimura, Ryuichi Hyakutake, Yoshihiro Ueda, Takeo Kawabata
Summary: Asymmetric regioselective vinylogous aza-Morita-Baylis-Hillman reactions were conducted using organocatalysis. The reactions between 3-vinylcyclopentenone and various aldimines, in the presence of chiral pyrrolidinopyridine catalysts, yielded 7-adducts with high regioselectivity and moderate enantioselectivity.
TETRAHEDRON LETTERS
(2023)
Article
Chemistry, Physical
Venkatachalam Angamuthu, Chia-Hung Lee, Dar-Fu Tai
Summary: Brucine diol (BD) catalyzed asymmetric Morita-Baylis-Hillman (MBH) reaction is observed for the first time, with Brucine N-oxide (BNO) found to not be an effective chiral catalyst. Faster reaction rates were achieved with unsaturated esters or aromatic aldehydes in the presence of BNO, while the tertiary amine of BD activates vinyl ketone for coupling with aldehyde through an intramolecular carbonylated reaction.
Article
Chemistry, Organic
Pankaj Roy, Santanu Mukherjee
Summary: A highly enantioselective formal alpha-allylic alkylation of acrylonitrile is achieved using 4-cyano-3-oxotetrahydrothiophene(c-THT) as a substitute. The two-step process involves an Ir(I)/(P,olefin)-catalyzed branched-selective allylic alkylation using easily accessible branched rac-allylic alcohols as the allylic electrophile followedby retro-Dieckmann/retro-Michael fragmentation. The method is applicable for the enantioselective synthesis of alpha-allylic acrylates and alpha-allylic acrolein.
Article
Chemistry, Organic
Shilpa Barik, Sayan Shee, Akkattu T. Biju
Summary: This study presents the N-Heterocyclic carbene (NHC)-catalyzed umpolung of cyclopent-4-ene-1,3-diones, which involves the generation of nucleophilic deoxy-Breslow intermediates. The carbene generated from a commercially available thiazolium salt was found to catalyze the cross-coupling reaction between cyclopent-4-ene-1,3-diones and isatins, resulting in functionalized oxindoles with moderate to good yields and good functional group compatibility. The key deoxy-Breslow intermediates were characterized by X-ray analysis, and detailed mechanistic studies were conducted.
Article
Chemistry, Organic
Xi Chen, Min Liu, Jiaqing Xu, Lei Wang, Songcheng Yu, Yongjun Wu, Jiaxing Huang, Hongchao Guo
Summary: A phosphine-catalyzed (3+2) annulation of Morita-Baylis-Hillman carbonates with pyrazolinone-derived ketimines has been achieved to give a variety of functionalized spirodihydropyrrole-dihydropyrazolones in moderate to high yields with good diastereoselectivities.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Futao Peng, Liliang Huang, Junhai Huang, Huangdi Feng
Summary: The Aza-Morita-Baylis-Hillman cascade strategy mediated by 1,4-diazabicyclo-[2.2.2]octane (DABCO) was utilized to efficiently produce amino derived 1,6-dienes using a variety of primary amines. Surprisingly, using an aqueous medium promoted reaction efficiency and increased product yield. The protocol demonstrated significant advances in synthetic chemistry and pharmaceutical chemistry with its one-pot operation, high chemoselectivity, and broad substrate scope.
CHINESE JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Organic
Kai-Kai Wang, Jun Jing, Wen-Wen Zhou, Can Wang, Jun-Wei Ye, Ran Zhou, Ting-Ting Wang, Zhan-Yong Wang, Rongxiang Chen
Summary: A highly selective and divergent synthesis method for obtaining complex compounds was developed through Lewis base catalyzed switchable annulations of Morita-Baylis-Hillman carbonates with activated olefins. The reaction showed switchable [4 + 2] or [3 + 2] annulations via catalyst or substrate control, providing diverse architectures with high yields and excellent diastereoselectivities and regioselectivities. The synthetic utility of this strategy was further demonstrated through gram-scale experiments and simple transformations of the products.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Naruhiro Gondo, Ryuichi Hyakutake, Koki Fujimura, Yoshihiro Ueda, Katsuhiko Nakano, Ryosuke Tsutsumi, Masahiro Yamanaka, Takeo Kawabata
Summary: In this study, catalyst-controlled vinylogous aza-MBH reactions of vinylcyclopentenone were conducted, showing that DABCO-catalysis led to exclusive formation of alpha-adducts while DMAP-catalysis predominantly produced gamma-adducts. It was found that the rate-determining step for the DABCO-catalyzed reactions was the Mannich-type C-C bond forming step, while for the DMAP-catalyzed reactions, it appeared to be the beta-elimination step.
ASIAN JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Organic
Congcong Geng, Xingfu Wei, Yongqiang Xu, Jianhui Liu, Lizeng Peng, Baomin Wang
Summary: A series of bisindole-annulated thiopyran frameworks were synthesized with good yields and diastereoselectivities through DMAP-catalyzed reactions, offering a novel synthetic strategy for valuable indole-annulated sulfur heterocycle derivatives, which may have potential applications in organic synthesis and medicinal chemistry.
TETRAHEDRON LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Lei Zhang, Wangzhen Bao, Yuchen Liang, Wenjing Pan, Dongyang Li, Lichun Kong, Zhi-Xiang Wang, Bo Peng
Summary: This study demonstrates the reversal of stereoselectivity in MBH-type [3,3]-rearrangement by using a new pair of rearrangement partners, leading to the synthesis of different types of alpha-aryl alpha,beta-unsaturated carbonyl derivatives. Mechanistic studies provide insights into the reaction pathway and the opposite stereoselectivities observed.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Prashant Shukla, Ambika Asati, Devkumari Patel, Manorama Singh, Vijai K. K. Rai, Ankita Rai
Summary: This study reports on the Morita Baylis-Hillman (MBH) reaction using various aldehydes with acrylonitrile and methyl acrylate as electron-deficient alkenes. A novel catalyst, EDC.HCl, is utilized in the presence of CuI to synthesize the MBH adduct. The synthetic protocol shows excellent product yield (up to 99%), ambient reaction conditions, shorter reaction time, and no side product formation.
Article
Chemistry, Organic
Gaukhar Khassenova, Olga Garcia Mancheno
Summary: The Lewis base-Brønsted acid co-catalyzed Morita-Baylis-Hillman reaction of cyclic sulfamidate imines with acrylate-type Michael acceptors using equimolecular amounts of DABCO and acetic acid proved highly efficient and tolerated a wide range of substrates. The reaction provides a straightforward access to sulfamidates bearing alpha,beta-unsaturated chains, allowing for further functionalization of the products. The robustness and applicability of the method was demonstrated by performing a gram scale reaction and further functionalization of the MBH-adducts.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Ricardo Lucas Gomes Pimentel, Rodolfo B. da Silva, Mario Luiz Araujo de Almeida Vasconcellos, Claudio Gabriel Lima-Junior, Fausthon F. da Silva
Summary: This study explores the synthesis and characterization of a mixed-metal copper-manganese iminodiacetate 1D coordination polymer (Cu/Mn-IDA) and its application as a catalyst for the Morita-Baylis-Hillman reaction. The results demonstrate that under optimized conditions, the catalyst can achieve yields of up to 87% for various aldehyde substrates. Additionally, the catalyst exhibits good recyclability.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Chemistry, Multidisciplinary
Raghavan B. Sunoj
Summary: Computational chemistry has evolved into a highly interdisciplinary domain, shaping our molecular view of the world. This essay covers the historic, personal, and most modern manifestations of computational chemistry.
ISRAEL JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Organic
Manajit Das, Achyut Ranjan Gogoi, Raghavan B. Sunoj
Summary: In this paper, the molecular understanding of the role of protic solvents in organic transformations is explored using density functional and ab initio computational studies. The inclusion of explicit solvent molecules in crucial transition states has been found to improve the energetic estimates of organocatalytic and transition-metal-catalyzed reactions. An overview of the importance of an explicit-implicit solvation model is provided with the help of interesting examples.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Applied
Supratim Ghosh, Shilpa Shilpa, C. Athira, Raghavan B. Sunoj
Summary: This review highlights the importance of additives in transition metal catalyzed reactions and the establishment of molecular understanding of their role using modern computational chemistry tools. Explicit consideration of additives is crucial in identifying a more reasonable reaction mechanism of catalytic reactions.
TOPICS IN CATALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Soumi Tribedi, Raghavan B. Sunoj
Summary: The article discusses a novel method of chiral induction, utilizing DAPCy as a chiral catalyst to form chiral pyrrolidine derivatives through intramolecular nucleophilic addition, achieving a quantum conversion with 95% ee.
Article
Chemistry, Multidisciplinary
Md Emdadul Hoque, Ranjana Bisht, Anju Unnikrishnan, Sayan Dey, Mirja Md Mahamudul Hassan, Saikat Guria, Rama Nand Rai, Raghavan B. Sunoj, Buddhadeb Chattopadhyay
Summary: A method of para-selective borylation of aromatic amides is described using a newly designed ligand framework (defa), which shows excellent selectivity and reactivity for the para position. This method can contribute to the development of new catalytic systems and the synthesis of para-functionalized compounds.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Manajit Das, Pooja Sharma, Raghavan B. Sunoj
Summary: The integration of machine learning into chemical catalysis has become a new paradigm for reaction development. In this study, a ML workflow was developed to predict the enantioselectivity of a class of catalytic asymmetric transformation, namely the relay Heck reaction. The ML model, built using quantum chemically derived descriptors, showed a remarkable prediction accuracy and assisted in exploring unexplored reactions.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Organic
Mirja Md Mahamudul Hassan, Biplab Mondal, Sukriti Singh, Chabush Haldar, Jagriti Chaturvedi, Ranjana Bisht, Raghavan B. Sunoj, Buddhadeb Chattopadhyay
Summary: An efficient method for ligand-free Ir-catalyzed ortho borylation of arenes has been developed, which can be applied to various important compounds and pharmaceuticals. The mechanistic pathway of the reaction has been revealed through detailed investigations. The method displays a broad substrate scope and functional group tolerance, and has achieved successful borylation of various important molecules and drugs.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Multidisciplinary Sciences
Sukriti Singh, Raghavan B. Sunoj
Summary: Sustainable practices in chemical sciences can be better achieved by adopting interdisciplinary approaches that combine the advantages of machine learning in reaction discovery with small initial data. The use of a recurrent neural network-based deep generative model allows for effective learning and exploration of the chemical space, generating high-quality novel alcohol molecules.
Review
Chemistry, Multidisciplinary
Sukriti Singh, Raghavan B. Sunoj
Summary: In reaction development, higher efficiencies are desired and machine learning models can predict reaction outcomes for new choices of substrates/catalysts. However, applying machine learning to reaction discovery is challenging due to difficulties in molecular featurization, availability of quality data, and the choice of suitable models and their deployment. Feature engineering and feature learning methods can be effective in predicting reaction outcomes.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Chemistry, Physical
Cheng Zhang, Pragya Verma, Jiaxu Wang, Yiwei Liu, Xiao He, Ying Wang, Donald G. Truhlar, Zhonghua Liu
Summary: Kohn-Sham density functional theory is widely used for electronic structure calculations, and the screened-exchange functionals have improved the accuracy of predictions for solid-state properties. This study assesses the performance of six screened-exchange density functionals compared to local functionals in predicting band gaps and lattice constants. The results show that screened-exchange functionals have smaller errors and outperform local functionals. M06-SX shows the best overall performance, with smaller mean absolute errors and lower root-mean-squared errors for both band gaps and lattice constants.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Chemistry, Multidisciplinary
Supratim Ghosh, Avtar Changotra, David A. Petrone, Mayuko Isomura, Erick M. Carreira, Raghavan B. Sunoj
Summary: In this study, the mechanism of a chiral Ir-phosphoramidite-catalyzed asymmetric reductive deoxygenation reaction was investigated using density functional theory. It was found that Bi(OTf)3 promotes ionic and noncovalent interactions, which play a crucial role in nucleophile selectivity.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
C. Athira, A. Sreenithya, Christopher M. Hadad, Raghavan B. Sunoj
Summary: The increasing number of examples on cooperative dual catalysis involving organocatalysts and transition metal catalysts indicate their wider acceptance and utility in synthetic applications. In this study, computational investigation using density functional theory reveals the molecular mechanism and energetic features responsible for the high enantio-/diastereoselectivities and cooperativity in dual catalytic reactions.
Review
Chemistry, Physical
Shilpa Shilpa, Gargee Kashyap, Raghavan B. Sunoj
Summary: The burgeoning developments in machine learning have found notable applications in chemistry, particularly in the prediction of molecular properties and chemical reactions. This review highlights the recent advancements in ML implementations, ranging from ensemble-based models to graph neural networks. Accurate predictions in molecular property prediction, using methods such as D-MPNN, MolCLR, SMILES-BERT, and MolBERT, offer promising prospects in molecular design and drug discovery. Challenges in dealing with reaction data sets are discussed, alongside an optimistic outlook on the benefits of ML-driven workflows for various chemistry tasks.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Sandip Kumar Das, Subrata Das, Supratim Ghosh, Satyajit Roy, Monika Pareek, Brindaban Roy, Raghavan B. Sunoj, Buddhadeb Chattopadhyay
Summary: A new iron-porphyrin based catalytic system has been developed for intramolecular C-H amination of substituted tetrazolopyridines. This method exhibits high regioselectivity and excellent functional group tolerance, enabling the synthesis of three different classes of high-value N-heterocyclic scaffolds. The study also reveals the metalloradical activation mechanism of this catalytic system.
Article
Chemistry, Physical
Jonathan L. Snider, Ji Su, Pragya Verma, Farid El Gabaly, Joshua D. Sugar, Luning Chen, Jeffery M. Chames, A. Alec Talin, Chaochao Dun, Jeffrey J. Urban, Vitalie Stavila, David Prendergast, Gabor A. Somorjai, Mark D. Allendorf
Summary: A new bimetallic MOF-74 catalyst was developed to stabilize open metal sites and promote dehydrogenation reactions, improving hydrogen productivity and selectivity. The catalyst also showed activity for dehydrogenation of other alcohols, making it a potential efficient solid catalyst.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Organic
Faiza Diaba, Gisela Trenchs
Summary: The first violet light-mediated synthesis of gamma- and delta-lactams from N-alkenyl trichloroacetamides is reported in this paper. The reactions are conducted in tetrahydrofuran or 2-methyltetrahydrofuran as the sole solvent without catalysts or additives, under non-anhydrous conditions in an air atmosphere where the solvent serves as the radical initiator.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2024)
Article
Chemistry, Organic
Feroze Hussain, Sajjad Ahmed, Ashiq Hussain Padder, Qazi Naveed Ahmed
Summary: This study reports a novel and efficient one-pot synthesis method for mixed phosphorotrithioates, which does not require supplementary additives and shows broad applicability.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2024)
Article
Chemistry, Organic
Hyunjin Oh, Ikyon Kim
Summary: A new 1,2,4-triazole-pyrrolo[1,2-a]pyrazine hybrid system, 6-acylpyrrolo[1,2-a][1,2,4]triazolo[5,1-c]pyrazine, was synthesized using a catalyst-free method. This method involved sequential exposure of pyrrole-2-carbonitrile-derived substrates to DMF-DMA and acyl hydrazide, resulting in the formation of acylated pyrazine and 1,2,4-triazole rings, enabling the installation of various substituents at specific positions on the core skeleton.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2024)
Article
Chemistry, Organic
Ming Yan, Si-fan Wang, Yong-po Zhang, Jin-zhong Zhao, Zhuo Tang, Guang-xun Li
Summary: Here we developed an efficient photocatalytic approach for the convenient preparation of sulfinamides. The reaction allows for the gram-scale preparation of sulfinamides and the one-pot synthesis of various sulfonyl amides.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2024)
Article
Chemistry, Organic
Farzaneh Bandehali-Naeini, Zahra Tanbakouchian, Noushin Farajinia-Lehi, Nicolas Mayer, Morteza Shiri, Martin Breugst
Summary: Two tandem catalytic systems were developed for the synthesis of novel 3,4-disubstituted maleimides using the same Ugi adducts. Different maleimide structures can be synthesized using either Pd or Cu catalysis.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2024)
Article
Chemistry, Organic
Tanya Raghava, Anjan Chattopadhyay, Subhadeep Banerjee, Nivedita Sarkar
Summary: Amine substitution of two ortho fluorine atoms of tetrafluoroterephthalonitrile through SNAr chemistry is easily achievable. But further fluorine substitution is only possible under forcing conditions, yielding valuable fluorophores for bioimaging.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2024)
Review
Chemistry, Organic
Anju Chadha, Santosh Kumar Padhi, Selvaraj Stella, Sowmyalakshmi Venkataraman, Thangavelu Saravanan
Summary: Alcohol dehydrogenases are enzymes that use cofactors for oxidation or reduction reactions of alcohols or carbonyl compounds. They are utilized in green chemistry and have applications in the production of pharmaceuticals. Recombinant enzymes have solved the challenge of producing purified enzymes in large quantities. Engineered alcohol dehydrogenases have been used in asymmetric synthesis in industry. Various methods have been established for regenerating expensive cofactors to make the enzymatic process more efficient and economically viable.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2024)