The Mechanism and an Improved Asymmetric Allylboration of Ketones Catalyzed by Chiral Biphenols
作者:David S. Barnett、Philip N. Moquist、Scott E. Schaus
DOI:10.1002/anie.200904715
日期:2009.11.2
Giving it a boost: A mechanistic study of the enantioselective asymmetric titled reaction with allyldiisopropoxyborane catalyzed by chiral biphenols revealed a key ligand exchange process which liberates isopropyl alcohol. The addition of iPrOH to the reaction increases the overall rate and enantioselectivity. As a result an improved reaction, employing allyldioxaborinane with 1 and tBuOH, resulted
给它一个推动:对由手性双酚催化的烯丙基二异丙氧基硼烷的对映选择性不对称标题反应的机理研究揭示了一个关键的配体交换过程,它释放了异丙醇。向反应中加入i PrOH 提高了总速率和对映选择性。因此,使用烯丙基二氧硼烷与1和t BuOH的改进反应导致高产物产率和对映选择性。