Mannich-Type Reaction with Trifluoromethylated <i>N</i>,<i>O</i>-Hemiacetal: Facile Preparation of β-Amino-β-trifluoromethyl Carbonyl Compounds
作者:Jun Takaya、Hirotaka Kagoshima、Takahiko Akiyama
DOI:10.1021/ol005812e
日期:2000.6.1
On treatment of silyl enolates and an N,O-hemiacetal, derived from trifluoroacetaldehyde ethyl hemiacetal and p-anisidine, with GaCl(3) (0.2 equiv) and C(6)H(5)COCl (0.2 equiv) in propionitrile, Mannich-type reaction took place smoothly to afford beta-amino-beta-trifluoromethyl carbonylcompounds in high yields.
Provided is a composition comprising a fluorine-containing polymer and a silicon-containing compound, wherein the phosphorus content in the composition is 20 ppm or less.
Stereoselective synthesis of CF3-substituted aziridines by Lewis acid-mediated aziridination of aldimines with diazoacetates
作者:Takahiko Akiyama、Satoshi Ogi、Kohei Fuchibe
DOI:10.1016/s0040-4039(03)00854-2
日期:2003.5
Treatment of trifluoroacetaldehyde N,O-acetal with diazoacetate in the presence of a Lewis acid furnished CF3-substituted aziridinecarboxylates in good yields. Both cis and trans isomers were obtained stereoselectively by the proper choice of the ester substituents. Use of a chiral diazoacetate derived from (R)-pantolactone led to highly diastereoselective aziridination (94% de). (C) 2003 Elsevier Science Ltd. All rights reserved.