Stereochemical consequences of the lewis acid-promoted 3-aza-cope rearrangement of N-alkyl-N-allyl enamines
作者:Ggregory R. Cook、John R. Stille
DOI:10.1016/s0040-4020(01)86707-7
日期:1994.4
Internal and relative asymmetric induction were examined for the electrophile promoted 3-aza-Cope rearrangement of substituted N-alkyl-N-allyl enamines. In general, internal asymmetric induction was highly variable, and was dependent both upon the nature of the electrophilic reagent and substrate. However, substitution at C-4 of the substrate served to anchor the transition state of the substrates
检查了内部和相对不对称诱导的亲电试剂促进的取代的N-烷基-N-烯丙基烯胺的3-氮杂-Cope重排。通常,内部不对称感应是高度可变的,并且取决于亲电子试剂和底物的性质。然而,在底物的C-4处的取代起到锚定底物的过渡态的作用,并且产物选择性通常> 95:5。当N-烷基取代基被束缚到C-4时,获得了从五元环到九元环的扩环。