作者:Masaru Kondo、Kento Nakamura、Chandu G. Krishnan、Shinobu Takizawa、Tsukasa Abe、Hiroaki Sasai
DOI:10.1021/acscatal.1c00057
日期:2021.2.5
have been developed to control the catalytic activity by photoirradiation. Azobenzene binaphthyl crown ether (ABCE) can switch its reactivity and selectivity through structural transformation of the crown ether moiety induced by E/Z photoisomerization of azobenzene. (Z)-ABCE promoted enantioselective alkylation of the glycine Schiff base to afford chiral amino acidderivatives in good yields with high
A New Class of Acetophenone-based Cinchona Alkaloids as Phase-transfer Catalysts: Application to the Enantioselective Synthesis of α-Amino Acids
作者:Jian Lv、Liping Zhang、Lei Liu、Yongmei Wang
DOI:10.1246/cl.2007.1354
日期:2007.11.5
A new class of acetophenone-based cinchona alkaloid-derived quaternary ammonium salts were prepared and evaluated as phase-transfercatalysts in the enantioselective alkylation of glycine imine est...
Synthesis of Both Enantiomers of Chiral Phenylalanine Derivatives Catalyzed by Cinchona Alkaloid Quaternary Ammonium Salts as Asymmetric Phase Transfer Catalysts
作者:Lei Jin、Shuai Zhao、Xin Chen
DOI:10.3390/molecules23061421
日期:——
A practical synthesis of both enantiomers of unnatural phenylalanine derivatives by using two pseudoenantiomeric phase transfercatalysts is described. Through asymmetric α-alkylation of glycine Schiff base with substituted benzyl bromides and 1-(bromomethyl)naphthalene under the catalysis of O-allyl-N-(9-anthracenmethyl) cinchoninium bromide (1f) and O-allyl-N-(9-anthracenylmethyl)cinchonidium bromide