Gold-catalyzed oxidation of propargylic ethers with internal C–C triple bonds: Impressive regioselectivity enabled by inductive effect
作者:Kegong Ji、Brendan D'Souza、Jon Nelson、Liming Zhang
DOI:10.1016/j.jorganchem.2014.08.005
日期:2014.11
the cases of propargylic ethers, resulting in highly regioselective formation of beta-alkoxy-alpha,beta-unsaturated ketones (up to >50/1 selectivity) via alpha-oxo gold carbene intermediates. Ethers derived from primary propargylic alcohols can be reliably transformed in good yields, and various functional groups are tolerated. With substrates derived from secondary propargylic alcohols, the development
在炔丙基醚的情况下,CC三键的感应扰动决定了金催化内部CC三键氧化的区域化学,导致β-烷氧基-α,β-不饱和酮的高度区域选择性形成(高达> 50 / 1选择性)通过α-氧代金卡宾中间体。可以可靠地以高收率可靠地转化衍生自伯炔丙醇的醚,并且可以容忍各种官能团。利用衍生自仲炔丙醇的底物,新的P,N-双齿状配体的开发使得在所需的氢化物迁移上,竞争性烷基迁移至金卡宾中心的可能性降至最低。然而,苯基的优选迁移导致有效形成α-苯基-β-烷氧基-α,β-不饱和酮。