Highly Selective Allylborations of Aldehydes Using α,α-Disubstituted Allylic Pinacol Boronic Esters
作者:Matthew J. Hesse、Stéphanie Essafi、Charlotte G. Watson、Jeremy N. Harvey、David Hirst、Christine L. Willis、Varinder K. Aggarwal
DOI:10.1002/anie.201402995
日期:2014.6.10
α‐Disubstituted allylic pinacol boronic esters undergo highly selective allylborations of aldehydes to give tetrasubstituted homoallylic alcohols with exceptional levels of anti‐Z‐selectivity (>20:1). The scope of the reaction includes both acyclic and cyclic allylic boronic esters which lead to acyclic and exocyclic tetrasubstituted homoallylic alcohols. The use of β‐borylated allylic boronic esters gave fully
α,α-二取代烯丙基频哪醇硼酸酯经历的高选择性allylborations醛,得到四取代的高烯丙醇与特殊水平的抗- ž -选择性(> 20:1)。反应范围包括产生无环和环外四取代均烯丙基醇的无环和环状烯丙基硼酸酯。使用β-硼化的烯丙基硼酸酯得到带有硼酸酯的完全取代的烯烃,该酯经过进一步的交叉偶联,从而实现了高度模块化和立体选择性的方法合成二芳基四取代的烯烃。计算分析揭示了观察到的显着选择性的起源。