Optically active quarternary ammonium salt with axial chirality, method for producing thereof, and application thereof for asymmetric synthesis of &agr;-amino acid
申请人:Nagase & Co., Ltd.
公开号:US06340753B1
公开(公告)日:2002-01-22
A novel optically active quarternary ammonium salt with an axial chirality is provided. The quarternary ammonium salt can act as a phase-transfer catalyst to convert glycine derivatives into optically active &agr;-amino acid derivatives by stereoselectively alkylating the glycine derivatives. Furthermore, according to the present invention, intermediates useful for producing the novel quarternary ammonium can be produced.
作者:Andrea M. Hardman-Baldwin、Michael D. Visco、Joshua M. Wieting、Charlotte Stern、Shin-ichi Kondo、Anita E. Mattson
DOI:10.1021/acs.orglett.6b01783
日期:2016.8.5
Promising levels of enantiocontrol are observed in the silanediol-catalyzed addition of silyl ketene acetals to benzopyrylium triflates. This rare example of enantioselective, intermolecular chromenone functionalization with carbonyl containing nucleophiles has potential applications in the synthesis of bioactive chromanones and tetrahydroxanthones.
Molecular Design of a <i>C</i><sub>2</sub>-Symmetric Chiral Phase-Transfer Catalyst for Practical Asymmetric Synthesis of <i>α</i>-Amino Acids
作者:Takashi Ooi、Minoru Kameda、Keiji Maruoka
DOI:10.1021/ja991062w
日期:1999.7.1
Design of <i>N</i>-Spiro <i>C</i><sub>2</sub>-Symmetric Chiral Quaternary Ammonium Bromides as Novel Chiral Phase-Transfer Catalysts: Synthesis and Application to Practical Asymmetric Synthesis of α-Amino Acids
作者:Takashi Ooi、Minoru Kameda、Keiji Maruoka
DOI:10.1021/ja021244h
日期:2003.4.1
C(2)-symmetric chiralquaternaryammonium bromides 10 and 11 have been designed as a new, purely synthetic chiral phase-transfer catalyst, and readily prepared from commercially available optically pure 1,1'-bi-2-naphthol as a basic chiral unit. The details of the synthetic procedures of each requisite chiral binaphthyl subunit have been disclosed, and the structures of the assembled N-spiro chiral quaternary
Chiral‐Organotin‐Catalyzed Kinetic Resolution of Vicinal Amino Alcohols
作者:Hui Yang、Wen‐Hua Zheng
DOI:10.1002/anie.201909700
日期:2019.11.4
A highlyefficientkineticresolution of racemic amino alcohols has been achieved for the first time with a chiral tin catalyst. A chiral organotin compound with 3,4,5-trifluorophenyl groups at the 3,3'-positions of the binaphthyl framework enabled this transformation with excellent yield and highenantioselectivity. The process tolerates aryl- and alkyl-substituted amino alcohols and a variety of