Copper‐Catalyzed Triboration: Straightforward, Atom‐Economical Synthesis of 1,1,1‐Triborylalkanes from Terminal Alkynes and HBpin
作者:Xiaocui Liu、Wenbo Ming、Yixiao Zhang、Alexandra Friedrich、Todd B. Marder
DOI:10.1002/anie.201909376
日期:2019.12.19
A convenient and efficient one-step synthesis of 1,1,1-triborylalkanes was achieved via sequential dehydrogenative borylation and double hydroborations of terminal alkynes with HBpin (HBpin=pinacolborane) catalyzed by inexpensive and readily available Cu(OAc)2 . This process proceeds under mild conditions, furnishing 1,1,1-tris(boronates) with wide substrate scope, excellent selectivity, and good functional-group
在廉价且易得的 Cu(OAc)2 催化下,通过末端炔烃与 HBpin (HBpin=频哪醇硼烷) 的顺序脱氢硼化和双硼氢化反应,实现了 1,1,1-三硼基烷烃的便捷高效的一步合成。该工艺条件温和,得到的1,1,1-三(硼酸酯)底物范围广,选择性好,官能团耐受性好,适合克级合成,且收率不损失。1,1,1-三硼基烷烃可用于制备α-乙烯基硼酸酯和硼酸化环状化合物,这些化合物是有价值但以前罕见的化合物。可以通过碱介导的脱硼烷基化逐步引入不同的烷基以产生外消旋叔烷基硼酸酯,其可以容易地转化为有用的叔醇。