Indium-assisted aluminium-based stereoselective allylation of prostereogenic α,α-disubstituted cycloalkanones and imines
作者:Chennakesava Reddy、Srinivasarao Arulananda Babu、Nayyar Ahmad Aslam
DOI:10.1039/c4ra04293j
日期:——
Al0 for the allylation of a variety of prostereogenic α,α-disubstituted (hindered) cycloalkanones, 1,2-dione-based systems and various imino systems (CN functional groups) is reported. The stereoselective InCl3-catalyzed Al-based allylation of various 2-substituted-2-carbethoxycycloalkanones gave the corresponding products with moderate to excellent diastereoselectivity. The allylation and propargylation
Enantioselective Alkylation of β-Keto Esters by Phase-Transfer Catalysis Using Chiral Quaternary Ammonium Salts
作者:Eun Joo Park、Mi Hee Kim、Dae Young Kim
DOI:10.1021/jo0401772
日期:2004.10.1
Catalytic enantioselectivealkylationpromoted by a quaternary ammonium salt from cinchonine as a phase transfer catalyst is described. Treatment of cyclo β-ketoesters with alkyl halide under mild reaction conditions afforded the corresponding α-alkylated β-ketoesters in moderate to excellent yields with high enantiomeric excesses