Enantioselective Synthesis of 3,4-Chromanediones via Asymmetric Rearrangement of 3-Allyloxyflavones
作者:Jean-Charles Marié、Yuan Xiong、Geanna K. Min、Adam R. Yeager、Tohru Taniguchi、Nina Berova、Scott E. Schaus、John A. Porco
DOI:10.1021/jo100889c
日期:2010.7.2
Asymmetric scandium(III)-catalyzed rearrangement of 3-allyloxyflavones was utilized to prepare chiral, nonracemic 3,4-chromanediones in high yields and enantioselectivities. These synthetic intermediates have been further elaborated to novel heterocyclic frameworks including angular pyrazines and dihydropyrazines. The absolute configuration of rearrangement products was initially determined by a nonempirical
利用不对称钪 (III) 催化的 3-烯丙氧基黄酮重排以高产率和对映选择性制备手性、非外消旋 3,4-色二酮。这些合成中间体已被进一步细化为新型杂环骨架,包括角吡嗪和二氢吡嗪。重排产物的绝对构型最初是通过圆二色性 (CD) 的非经验分析使用时间相关密度泛函理论 (TDDFT) 计算确定的,并通过腙衍生物的 X 射线晶体学验证。该机制的初步研究支持可能通过苯并吡喃中间体进行的分子内重排途径。