Regioselective Carbonylation of 2,2-Disubstituted Epoxides: An Alternative Route to Ketone-Based Aldol Products
作者:Aran K. Hubbell、Anne M. LaPointe、Jessica R. Lamb、Geoffrey W. Coates
DOI:10.1021/jacs.8b12286
日期:2019.2.13
report the regioselective carbonylation of 2,2-disubstituted epoxides to β,β-disubstituted β-lactones. Mechanistic studies revealed epoxide ring-opening as the turnover limiting step, an insight that facilitated the development of improved reaction conditions using weakly donating, ethereal solvents. A wide range of epoxides can be carbonylated to β-lactones, which are subsequently ring-opened to produce
我们报告了 2,2-二取代环氧化物到 β,β-二取代 β-内酯的区域选择性羰基化。机理研究表明,环氧化物开环是周转限制步骤,这一见解有助于使用弱供体的醚溶剂开发改进的反应条件。广泛的环氧化物可以羰基化为 β-内酯,随后开环产生基于酮的醛醇加合物,为 Mukaiyama 醛醇反应提供替代方案。对映纯的环氧化物被证明经过羰基化/开环过程并保留立体化学以形成对映纯的 β-羟基酯。