Diastereoselective Reactions of δ-Oxy-Substituted Allylic Acetates with Organocopper Reagents
作者:Jennifer L. Belelie、J. Michael Chong
DOI:10.1021/jo016310x
日期:2002.5.1
S(N)2' (gamma) substitutions of delta-substituted allylic acetates with Grignard reagents and copper catalysts proceed with high diastereoselectivities. With benzyloxy, methoxymethoxy, and tert-butyldimethylsiloxy groups, reactions favor the anti-isomer with selectivities up to anti:syn = >99:1. With a hydroxyl group, selectivities are reversed and the syn-isomer is favored with selectivities up to
用格氏试剂和铜催化剂用δ-取代的烯丙基乙酸酯进行S(N)2'(γ)取代,具有很高的非对映选择性。具有苄氧基,甲氧基甲氧基和叔丁基二甲基甲硅烷氧基的反应有利于抗异构体,其选择性高达anti:syn => 99:1。在具有羟基的情况下,选择性被逆转并且顺式异构体优选具有高达抗:syn = <1:99的选择性。