A practically simple, highly enantioselective Brønstedacidcatalyzedα‐aminoxylation of enecarbamates extends the substrate scope for the α‐aminoxylation to linear and aromatic ketones, allowing convergent and stereoselective access to valuable α‐hydroxy ketones, β‐amino alcohols, and cis‐oxazolidinones.
Enantioselective Nitroso Aldol Reaction Catalyzed by QuinoxP*·Silver(I) Complex and Tin Methoxide
作者:Akira Yanagisawa、Satoshi Takeshita、Youhei Izumi、Kazuhiro Yoshida
DOI:10.1021/ja910588w
日期:2010.4.21
A catalytic enantioselective O-nitroso aldol reaction of alkenyl trichloroacetates with nitrosoarenes was achieved using the (R,R)-t-Bu-QuinoxP*.AgOAc complex as the chiral catalyst and Bu(2)Sn(OMe)(2) as the achiral cocatalyst in the presence of methanol. Optically active alpha-aminooxy ketones with up to 99% ee were regioselectively obtained in high yields from various alkenyl trichloroacetates of
使用 (R,R)-t-Bu-QuinoxP*.AgOAc 配合物作为手性催化剂和 Bu(2)Sn(OMe)(2) 作为手性催化剂,实现了烯基三氯乙酸酯与亚硝基芳烃的催化对映选择性 O-亚硝基羟醛反应在甲醇存在下的非手性助催化剂。具有高达 99% ee 的光学活性 α-氨基氧基酮以高产率从环酮的各种烯基三氯乙酸酯中获得。