Reaction of Allylzinc Reagents and Zinc Enolates of Ketones with α-Amidoalkylphenyl Sulfones
作者:Marino Petrini、Roberto Profeta、Paolo Righi
DOI:10.1021/jo025606f
日期:2002.6.1
Alpha-amidoalkylphenyl sulfones behave as N-acylimino equivalents in the reaction with functionalized allylzinc reagents. The addition products obtained using the zinc derivative of ethyl 2-(bromomethyl)acrylate can be readily transformed into alpha-methylene-gamma-lactams using different cyclization procedures. The allylzinc reagent obtained from 3-bromo-1-acetoxy-1-propene directly affords protected
α-酰胺基烷基苯基砜在与官能化烯丙基锌试剂的反应中表现为N-嘧啶基当量。使用2-(溴甲基)丙烯酸乙酯的锌衍生物获得的加成产物可以使用不同的环化方法容易地转化为α-亚甲基-γ-内酰胺。由3-溴-1-乙酰氧基-1-丙烯获得的烯丙基锌试剂直接提供受保护的1,2-氨基醇,优选使用抗立体异构体,而与所用α-酰胺基烷基苯基砜的结构无关。该程序可以扩展到使用从α-溴酮获得的烯醇锌,并导致合成N-保护的β-氨基酮。