Article
Chemistry, Medicinal
Amila Agampodi Dewa, Ahmed H. Elbanna, Zeinab G. Khalil, Robert J. Capon
Summary: This report presents a structure-activity relationship (SAR) analysis method for a newly discovered P-gp inhibitory pharmacophore, and successfully isolated structurally diverse pharmacophores using an innovative precursor-directed biosynthesis strategy. The study provides key structure requirements for designing P-gp inhibitors, and identifies non-essential sites that allow for the design of affinity and other conjugated probes.
JOURNAL OF MEDICINAL CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Srinivas Chamakuri, Sunny Ann Tang, Kevin A. Tran, Shiva Krishna Reddy Guduru, Peter K. Bolin, Kevin R. MacKenzie, Damian W. Young
Summary: A short synthetic route has been reported for synthesizing 2,3-substituted piperazine acetic acid esters. Optically pure amino acids were efficiently converted into 1,2-diamines, which were used to deliver the target compounds with high enantiomeric purity in five steps. This novel synthesis route enabled the synthesis of 3-phenyl substituted-2-piperazine acetic acid esters, which were difficult to achieve using other methods, although racemization occurred in this case.
Article
Chemistry, Analytical
Chiara Lucia Milanesi, Stefano Protti, Debora Chiodi, Antonella Profumo, Daniele Merli
Summary: This study describes the electrochemical behavior and voltammetric determination of aryl piperazines of forensic interest, with developed analytical protocol having low Limit of Detection values. The clean-up/preconcentration process using SPE with Florisil enables the detection and quantification of these compounds in biological matrices such as urine.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Biochemical Research Methods
Jiahua Ji, Yunfeng Zhang, Ying Zhang, Jing Chang, Aihua Wang, Hong Zhou, Yao Liu, Jifen Wang
Summary: The abuse of new psychoactive substances (NPS) has posed a serious threat to social security and public safety. Therefore, there is an urgent need to develop an effective method for detecting NPS. In this study, direct analysis in real-time tandem mass spectrometry (DART-MS/MS) was used to successfully detect 11 NPS in blood and urine. The method showed high efficiency, speed, and environmental friendliness, and may become a promising technology for NPS detection in the future.
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
(2023)
Article
Chemistry, Medicinal
William Nguyen, Madeline G. Dans, Anna Ngo, Maria R. Gancheva, Ornella Romeo, Sandra Duffy, Tania F. de Koning-Ward, Kym N. Lowes, Helene Jousset Sabroux, Vicky M. Avery, Danny W. Wilson, Paul R. Gilson, Brad E. Sleebs
Summary: The phenylsulfonyl piperazine class has been identified as a specific inhibitor of erythrocyte invasion by P. falciparum parasites, showing antimalarial activity and potency against multidrug resistant strains. The optimized compounds also exhibit weak activity against sexual stage gametocytes, making them potentially useful tools for studying Plasmodium erythrocyte invasion.
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
(2021)
Article
Chemistry, Applied
Maria Distressa G. Billacura, Ryan D. Lewis, Neil Bricklebank, Alex Hamilton, Christopher J. Whiteoak
Summary: This study presents the application of a binary Ga-based catalyst system for the coupling of CO2 and aziridines to form oxazolidinones. The catalyst system has been optimized for selective formation of a single regioisomer with high yield under mild reaction conditions. Substituted aziridines derived from styrene oxide have been successfully used as substrates. The reaction mechanism has been investigated through DFT study, revealing an unusual ligand assistance in the synthesis of oxazolidinones.
ADVANCED SYNTHESIS & CATALYSIS
(2023)
Article
Biochemistry & Molecular Biology
Evgeny V. Pospelov, Alexey Yu. Sukhorukov
Summary: A new method for synthesizing piperazine derivatives with substituents at carbon and nitrogen atoms was developed using primary amines and nitrosoalkenes. The method involves sequential double Michael addition of nitrosoalkenes to amines to form bis(oximinoalkyl)amines, followed by stereoselective catalytic reductive cyclization of the oxime groups. This method allows for straightforward structural modification of bioactive molecules by converting a primary amino group into a piperazine ring.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Yu-Ping He, Hua Wu, Qian Wang, Jieping Zhu
Summary: A chiral phosphoric acid-catalyzed enantioselective synthesis of C3-substituted morpholinones is reported in this study, which has important applications in organic synthesis and medicinal chemistry. The reaction can also be applied to the concise synthesis of the neurokinin-1 receptor antagonist L-742,694.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Rohit Pal, Md Jawaid Akhtar, Khadga Raj, Shamsher Singh, Priyanka Sharma, Sourav Kalra, Pooja A. Chawla, Bhupinder Kumar
Summary: A new series of N-(5,6-diphenyl-1,2,4-triazin-3-yl)-2-(4-substituted piperazin-1-yl) acetamide (RP1-5) and 2-((5,6-diphenyl-1,2,4-triazin-3-yl)thio)-1-(4-substituted piperazin1-yl)-ethan-1-one (RP6-10) derivatives were designed and synthesized. Two compounds (RP4 and RP5) exhibited the most potent anticonvulsant activity and significant antidepressant activity in mice models.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Chemistry, Multidisciplinary
Amol B. Viveki, Timothy M. Mansfield, Kevin A. Tran, Evan Lenkeit, Kevin R. Mackenzie, Damian W. Young, Srinivas Chamakuri
Summary: A heterocyclic merging approach was used to construct novel indazolo-piperazines and indazolo-morpholines. Starting from chiral diamines and amino alcohols, diverse cohorts of indazolo-piperazines and indazolo-morpholines with regiochemical (1,3 and 1,4) and stereochemical (relative and absolute) variations were obtained within six or seven steps. The key transformations involved a Smiles rearrangement to generate the indazole core structure and a late-stage Michael addition to build the piperazine and morpholine heterocycles. Additional diversity was explored by incorporating substitutions on the indazole aromatic ring, resulting in 20 unique, enantiomerically pure heterocyclic scaffolds.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Medicinal
Kate McGonagle, Gary J. Tarver, Juan Cantizani, Ignacio Cotillo, Peter G. Dodd, Liam Ferguson, Ian H. Gilbert, Maria Marco, Tim Miles, Claire Naylor, Maria Osuna-Cabello, Christy Paterson, Kevin D. Read, Erika G. Pinto, Jennifer Riley, Paul Scullion, Yoko Shishikura, Frederick Simeons, Laste Stojanovski, Nina Svensen, John Thomas, Paul G. Wyatt, Pilar Manzano, Manu De Rycker, Michael G. Thomas
Summary: This study describes a series of disubstituted piperazines with good potency against Trypanosoma cruzi, but poor metabolic stability. Strategies such as lowering logD, bioisosteric replacements, and plate-based arrays are used to address this issue. The challenges of improving pharmacokinetic profile while maintaining potency are discussed.
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Luis Tarifa, M. Pilar del Rio, Laura Asensio, Jose A. Lopez, Miguel A. Ciriano, Ana M. Geer, Cristina Tejel
Summary: A straightforward catalytic method for the synthesis of complex C-substituted piperazines has been developed based on an uncommon head-to-head coupling of easily prepared imines. This efficient process allows the selective formation of a sole diastereoisomer, exhibits a broad substrate scope, and shows good functional group tolerance using a bench-stable iridium catalyst under mild reaction conditions. The addition of N-oxides notably enhances the catalytic activity and selectivity.
Article
Biochemistry & Molecular Biology
Srinivas Chamakuri, Mee-Kyung Chung, Errol L. G. Samuel, Kevin A. Tran, Ying-Chu Chen, Pranavanand Nyshadham, Conrad Santini, Martin M. Matzuk, Damian W. Young
Summary: The study successfully constructed a novel DNA-Encoded Chemical Library (DECL) by utilizing enantiomerically pure piperazines as central cores, introducing the concept of positional diversity and producing a diverse library of 77 million compounds. Cheminformatic analysis showed that the library occupies a wide range of chemical space and the piperazine scaffolds confer different shape diversity compared to the commonly used triazine core.
BIOORGANIC & MEDICINAL CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Xiu-jie Liu, Yan Wang, Xiao Wang, Zhi-hao Zhang
Summary: A total of 20 novel antiplatelet drugs were designed and synthesized, with in vitro experiments evaluating their activity and preliminary analysis of structure-activity relationship conducted. Some compounds showed higher antiplatelet activity than common drugs, with two potential compounds exhibiting excellent performance in cytotoxicity testing.
BIOORGANIC & MEDICINAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Baswaraju Macha, Ravindra Kulkarni, Anil Kumar Garige, Shivani Pola, Raghuramrao Akkinepally, Achaiah Garlapati
Summary: A new series of cholinesterase inhibitors were designed and synthesized based on tacrine structure, with some compounds showing similar potency to tacrine against AChE and BuChE, as well as safer liver toxicity profile. Docking studies revealed close hydrogen bond interactions within the binding site for all molecules.
Article
Biochemical Research Methods
Mitsuhiro Wada, Keisuke Abe, Rie Ikeda, Ruri Kikura-Hanajiri, Naotaka Kuroda, Kenichiro Nakashima
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2011)
Article
Biochemical Research Methods
Mitsuhiro Wada, Kozue Yamahara, Rie Ikeda, Ruri Kikura-Hanajiri, Naotaka Kuroda, Kenichiro Nakashima
BIOMEDICAL CHROMATOGRAPHY
(2012)
Review
Substance Abuse
M. D. Arbo, M. L. Bastos, H. F. Carmo
DRUG AND ALCOHOL DEPENDENCE
(2012)
Article
Medicine, Legal
Karim M. Abdel-Hay, C. Randall Clark, Jack DeRuiter
FORENSIC SCIENCE INTERNATIONAL
(2013)
Article
Chemistry, Analytical
Shawn P. Vorce, Justin M. Holler, Barry Levine, Marilyn R. Past
JOURNAL OF ANALYTICAL TOXICOLOGY
(2008)
Article
Chemistry, Analytical
Amber J. Dickson, Shawn P. Vorce, Justin M. Holler, Timothy P. Lyons
JOURNAL OF ANALYTICAL TOXICOLOGY
(2010)
Article
Biochemical Research Methods
I. E. D. Moreno, B. M. da Fonseca, A. R. Magalhaes, V. S. Geraldes, J. A. Queiroz, M. Barroso, S. Costa, E. Gallardo
JOURNAL OF CHROMATOGRAPHY A
(2012)
Article
Chemistry, Analytical
I. E. D. Moreno, B. M. da Fonseca, M. Barroso, S. Costa, J. A. Queiroz, E. Gallardo
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
(2012)
Article
Chemistry, Analytical
Jitka Siroka, Daniel N. Polesel, Jose L. Costa, Rafael Lanaro, Marina F. M. Tavares, Miroslav Polasek
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
(2013)
Article
Toxicology
Marcelo Dutra Arbo, Renata Silva, Daniel Jose Barbosa, Diana Dias da Silva, Luciana Grazziotin Rossato, Maria de Lourdes Bastos, Helena Carmo
TOXICOLOGY LETTERS
(2014)
Article
Behavioral Sciences
H. L. Yarosh, E. B. Katz, A. Coop, W. E. Fantegrossi
PHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR
(2007)
Article
Behavioral Sciences
K Tokumo, N Tamura, T Hirai, H Nishio
BEHAVIOURAL BRAIN RESEARCH
(2006)
Article
Biochemistry & Molecular Biology
AJ Bojarski, MH Paluchowska, B Duszynska, A Klodzinska, E Tatarczynska, E Chojnacka-Wójcik
BIOORGANIC & MEDICINAL CHEMISTRY
(2005)
Article
Toxicology
David M. Wood, Jenny Button, Satnam Lidder, John Ramsey, David W. Holt, Paul I. Dargan
JOURNAL OF MEDICAL TOXICOLOGY
(2008)