Modular Asymmetric Synthesis of 1,2-Diols by Single-Pot Allene Diboration/Hydroboration/Cross-Coupling
作者:Nicholas F. Pelz、James P. Morken
DOI:10.1021/ol0616891
日期:2006.9.1
Chiral allyl vinyl boronates are generated by catalytic enantioselective diboration of prochiral allenes. They may then be reacted, in situ, with a hydroborating reagent to form a novel triboron intermediate. The least hindered and most reactive C-B bond then participates in cross-coupling wherein the coupling is brought about by the same catalyst as that which catalyzed the diboration reaction. The
手性烯丙基乙烯基硼酸酯是通过前手性烯丙基的催化对映选择性二硼化而生成的。然后可以使它们与硼氢化试剂原位反应以形成新型三硼中间体。然后受阻最少和反应性最强的CB键参与交叉偶联,其中偶联是通过与催化双硼化反应的催化剂相同的催化剂进行的。然后在反应后处理中将剩余的CB键氧化,从而允许以简明的单罐方式模块化合成手性二醇。