Chiral quaternary phosphonium salts as phase-transfer catalysts for environmentally benign asymmetric transformations

Dipeptide-Derived Multifunctional Quaternary Phosphonium Salt Catalyzed Asymmetric Cyclizations via a Tandem Michael Addition/SN2 Sequence

(2015) Dongdong Cao et al.   CHEMISTRY-A EUROPEAN JOURNAL

Synergistic Catalysis of Ionic Brønsted Acid and Photosensitizer for a Redox Neutral Asymmetric α-Coupling of N-Arylaminomethanes with Aldimines

(2015) Daisuke Uraguchi et al.   JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

Enantioselective Direct Mannich Reactions of Cyclic β-Ketoesters Catalyzed by Chiral Phosphine via a Novel Dual-Reagent Catalysis

(2015) Yan-Peng Lou et al.   ORGANIC LETTERS

Contemporary Asymmetric Phase Transfer Catalysis: Large-Scale Industrial Applications

(2015) Jiajing Tan et al.   ORGANIC PROCESS RESEARCH & DEVELOPMENT

Enantioselective desymmetrization of meso-aziridines with aromatic thiols catalyzed by chiral bifunctional quaternary phosphonium salts derived from α-amino acids

(2015) Jiaxing Zhang et al.   TETRAHEDRON

Phase-Transfer-Catalyzed Asymmetric SNAr Reaction of α-Amino Acid Derivatives with Arene Chromium Complexes

(2014) Seiji Shirakawa et al.   ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Catalytic Asymmetric Synthesis of 3,3′-Diaryloxindoles as Triarylmethanes with a Chiral All-Carbon Quaternary Center: Phase-Transfer-Catalyzed SNAr Reaction

(2014) Seiji Shirakawa et al.   ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Asymmetric Dual-Reagent Catalysis: Mannich-type Reactions Catalyzed by Ion Pair

(2014) Hong-Yu Wang et al.   ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

A Base-Free Neutral Phase-Transfer Reaction System

(2014) Seiji Shirakawa et al.   Chemistry-An Asian Journal

Effect of Brønsted acid co-catalyst in asymmetric conjugate addition of 3-aryloxindoles to maleimide under base-free phase-transfer conditions

(2014) Seiji Shirakawa et al.   TETRAHEDRON

Asymmetric phase-transfer reactions under base-free neutral conditions

(2014) Seiji Shirakawa et al.   TETRAHEDRON LETTERS

Phase-Transfer-Catalyzed Asymmetric α-Arylation of α-Amino Acid Derivatives

(2014) Seiji Shirakawa et al.   Asian Journal of Organic Chemistry

Amino Acid-Derived Phosphonium Salts-Catalyzed Michael Addition of 3-Substituted Oxindoles

(2013) Xiaoyu Wu et al.   ADVANCED SYNTHESIS & CATALYSIS

Recent Developments in Asymmetric Phase-Transfer Reactions

(2013) Seiji Shirakawa et al.   ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Thiourea-phosphonium salts from amino acids: cooperative phase-transfer catalysts in the enantioselective aza-Henry reaction

(2013) Dongdong Cao et al.   CHEMICAL COMMUNICATIONS

P-Spiro phosphonium salts catalyzed asymmetric fluorination of 3-substituted benzofuran-2(3H)-ones

(2013) Chuan-Le Zhu et al.   JOURNAL OF FLUORINE CHEMISTRY

Design of Chiral Bifunctional Quaternary Phosphonium Bromide Catalysts Possessing an Amide Moiety

(2013) Seiji Shirakawa et al.   ORGANIC LETTERS

Novel bifunctional thiourea–ammonium salt catalysts derived from amino acids: application to highly enantio- and diastereoselective aza-Henry reaction

(2013) Hong-Yu Wang et al.   TETRAHEDRON

Efficient approach for the design of effective chiral quaternary phosphonium salts in asymmetric conjugate additions

(2013) Seiji Shirakawa et al.   Chemical Science

Chiral Phosphine Catalyzed Asymmetric Michael Addition of Oxindoles

(2012) Fangrui Zhong et al.   ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

New Neutral Reaction System with Crown Ether-KCl Complexes in Aqueous Solution

(2012) Seiji Shirakawa et al.   CHEMISTRY-A EUROPEAN JOURNAL

The direct catalytic asymmetric aldol reaction of α-substituted nitroacetates with aqueous formaldehyde under base-free neutral phase-transfer conditions

(2012) Seiji Shirakawa et al.   ORGANIC & BIOMOLECULAR CHEMISTRY

Chiral quaternary phosphonium salts: a new class of organocatalysts

(2012) Dieter Enders et al.   ORGANIC & BIOMOLECULAR CHEMISTRY

Chiral ionic Brønsted acid–achiral Brønsted base synergistic catalysis for asymmetric sulfa-Michael addition to nitroolefins

(2012) Daisuke Uraguchi et al.   Chemical Science

Asymmetric Neutral Amination of Nitroolefins Catalyzed by Chiral Bifunctional Ammonium Salts in Water-Rich Biphasic Solvent

(2011) Lijia Wang et al.   ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Enantioselective Base-Free Electrophilic Amination of Benzofuran-2(3H)-ones: Catalysis by Binol-Derived P-Spiro Quaternary Phosphonium Salts

(2011) Chuan-Le Zhu et al.   ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Diastereo- and enantioselective conjugate addition of α-substituted nitroacetates to maleimides under base-free neutral phase-transfer conditions

(2011) Seiji Shirakawa et al.   CHEMICAL COMMUNICATIONS

A Systematic Investigation of Quaternary Ammonium Ions as Asymmetric Phase-Transfer Catalysts. Synthesis of Catalyst Libraries and Evaluation of Catalyst Activity

(2011) Scott E. Denmark et al.   JOURNAL OF ORGANIC CHEMISTRY

Design, synthesis, and application of tartaric acid derived N-spiroquaternary ammonium salts as chiral phase-transfer catalysts

(2011) Mario Waser et al.   ORGANIC & BIOMOLECULAR CHEMISTRY

Highly practical amino acid and alkaloid synthesis using designer chiral phase transfer catalysts as high-performance organocatalysts

(2010) Keiji Maruoka   CHEMICAL RECORD

Catalytic Asymmetric Protonation of α-Amino Acid-Derived Ketene Disilyl Acetals UsingP-Spiro Diaminodioxaphosphonium Barfates as Chiral Proton

(2010) Daisuke Uraguchi et al.   JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

Phosphonium Salt Organocatalysis

(2009) Thomas Werner   ADVANCED SYNTHESIS & CATALYSIS

Phosphonium Salts as Chiral Phase-Transfer Catalysts: Asymmetric Michael and Mannich Reactions of 3-Aryloxindoles

(2009) Rongjun He et al.   ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Cinchona-based phase-transfer catalysts for asymmetric synthesis

(2009) Sang-sup Jew et al.   CHEMICAL COMMUNICATIONS

Chiral bifunctional phase transfer catalysts for asymmetric fluorination of β-keto esters

(2009) Xisheng Wang et al.   CHEMICAL COMMUNICATIONS

Chiral Arylaminophosphonium Barfates as a New Class of Charged Brønsted Acid for the Enantioselective Activation of Nonionic Lewis Bases

(2009) Daisuke Uraguchi et al.   JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

Enantioselective Base-Free Phase-Transfer Reaction in Water-Rich Solvent

(2009) Rongjun He et al.   JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

Chiral Organic Ion Pair Catalysts Assembled Through a Hydrogen-Bonding Network

(2009) D. Uraguchi et al.   SCIENCE

Highly efficient asymmetric amination of β-keto esters catalyzed by chiral quaternary ammonium bromides

(2009) Quan Lan et al.   TETRAHEDRON LETTERS

Binaphthyl-Modified Quaternary Phosphonium Salts as Chiral Phase-Transfer Catalysts: Asymmetric Amination of β-Keto Esters

(2008) Rongjun He et al.   ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Site-Directed Asymmetric Quaternization of a Peptide Backbone at a C-Terminal Azlactone

(2008) Daisuke Uraguchi et al.   ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Combinatorial Design of Simplified High-Performance Chiral Phase-Transfer Catalysts for Practical Asymmetric Synthesis of α-Alkyl- and α,α-Dialkyl-α-Amino Acids

(2008) Masanori Kitamura et al.   Chemistry-An Asian Journal

Synthesis of Enantiopure 1-r-Alkyl-2-c,5-t-Diphenylphospholanes and Phospholanium Salts through Direct Alkylation of Phospholane

(2008) Cristian Dobrota et al.   EUROPEAN JOURNAL OF ORGANIC CHEMISTRY

Chiral Tetraaminophosphonium Carboxylate-Catalyzed Direct Mannich-Type Reaction

(2008) Daisuke Uraguchi et al.   JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

Practical Aspects of Recent Asymmetric Phase-Transfer Catalysis

(2008) Keiji Maruoka   ORGANIC PROCESS RESEARCH & DEVELOPMENT