Diastereoselectivity in the Reduction of α-Oxy- and α-Amino-Substituted Acyclic Ketones by Polymethylhydrosiloxane
作者:Durgesh Nadkarni、James Hallissey、Carlos Mojica
DOI:10.1021/jo0260544
日期:2003.1.1
Diastereoselectivity in the reduction of alpha-alkoxy-, alpha-acyloxy-, and alpha-alkylamino-substituted ketones with polymethylhydrosiloxane (PMHS) in the presence of fluoride ion catalysis was investigated. High syn-selectivity was observed in the reduction of alpha-alkoxy, alpha-acyloxy, and alpha-dialkylamino ketones. Reduction of alpha-monoalkylamino ketone proceeded in anti-selective manner with
研究了在氟离子催化下,用聚甲基氢硅氧烷(PMHS)还原α-烷氧基-,α-酰氧基-和α-烷基氨基取代的酮的非对映选择性。在还原α-烷氧基,α-酰氧基和α-二烷基氨基酮中观察到高的顺选择性。α-单烷基氨基酮的还原以中等选择性的反选择性方式进行。基于Felkin-Anh和Cram-chelate模型解释了观察到的选择性。