Desymmetrization of (<i>R</i>,<i>R</i>)-Hexa-1,5-diene-3,4-diol via Monofunctionalization and Rhodium-Catalyzed Allylic Substitution
作者:Bernd Schmidt、Lucia Staude
DOI:10.1021/jo2001337
日期:2011.4.1
A sequence of selective monoprotection and Rh-catalyzed enantioconservative allylic substitution is established as a desymmetrization strategy for C2-symmetric hexa-1,5-diene-3,4-diol. A benzyl protecting group and ethyl carbonate as a leaving group emerged as the most useful combination with respect to reproducibility, stereoselectivity, and yield. A remarkable deviation from the normally observed
建立了选择性单保护和Rh催化的对映保守性烯丙基取代的序列,作为C 2对称的hexa-1,5-diene-3,4-diol的去对称化策略。就可再现性,立体选择性和产率而言,苄基保护基和作为离去基团的碳酸乙酯是最有用的组合。对于未保护的碳酸盐,观察到与通常观察到的Rh催化的烯丙基烷基化的区域特异性显着偏离。在这种情况下,仅获得线性而不是支链的烷基化产物。