Development of an Asymmetric Trimethylenemethane Cycloaddition Reaction: Application in the Enantioselective Synthesis of Highly Substituted Carbocycles
作者:Barry M. Trost、Steven M. Silverman、James P. Stambuli
DOI:10.1021/ja207550t
日期:2011.12.7
azetidine structures, is discussed. The conditions developed to effect an asymmetric TMM reaction using 2-trimethylsilylmethyl allyl acetate were shown to be tolerant of a wide variety of alkene acceptors, providing the desired methylenecyclopentanes with high levels of enantioselectivity. The donor scope was also explored, and substituted systems were tolerated, including one bearing a nitrile moiety. These
已经开发了三亚甲基甲烷 (TMM) 与缺电子烯烃的对映选择性 [3+2] 环加成的协议。在这项工作中,新型亚磷酰胺配体的合成至关重要,并且详细介绍了这些配体的制备和反应性。讨论了配体设计的演变,从无环胺衍生的亚磷酰胺开始,并导致环状吡咯烷和氮杂环丁烷结构。为使用乙酸 2-三甲基甲硅烷基甲基烯丙酯进行不对称 TMM 反应而开发的条件被证明可以耐受多种烯烃受体,从而提供具有高水平对映选择性的所需亚甲基环戊烷。还探索了供体范围,并且可以容忍替代系统,包括带有腈部分的系统。