Synthesis of Alkenyl Boronates from Epoxides with Di-[B(pin)]-methane via Pd-Catalyzed Dehydroboration
作者:Stephanie A. Murray、Eugenia C. M. Luc、Simon J. Meek
DOI:10.1021/acs.orglett.7b03853
日期:2018.1.19
A practical and broadly applicable catalytic method for the synthesis of (E)-alkenylborons is presented. Reactions are promoted by [Pd(Cl)(η3-C3H5)]2 and proceed by the dehydroboration of cyclic borates. Through the use of epoxides and readily available di-B(pin)-methane (pin = pinacolato), a range of allylic alcohol-containing alkenyl boronates, including those that contain a tertiary alcohol, may
提出了一种实用且广泛适用的合成(E)-烯基硼的催化方法。反应通过促进[加入Pd(Cl)的(η 3 -C 3 H ^ 5)] 2和由环状硼酸盐的dehydroboration进行。通过使用环氧化物和现成的二-B(pin)-甲烷(pin =频哪醇),可以制备一系列含烯丙基醇的烯基硼酸酯,包括那些含有叔醇的硼酸烯基硼酸酯,其收率可达75%。 > 20:1 é / ž。
A highly efficient kinetic resolution of γ- and β- trimethylsilyl secondary allylic alcohols by the sharpless asymmetric epoxidation