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