Chemoselective P(NMe<sub>2</sub>)<sub>3</sub>-Mediated Reductive Epoxidation between Two Different Carbonyl Electrophiles: Synthesis of Highly Functionalized Unsymmetrical Epoxides
作者:Rong Zhou、Honghui Zhang、Jialin Liu、Rongfang Liu、Wen-Chao Gao、Yan Qiao、Ruifeng Li
DOI:10.1021/acs.joc.8b00995
日期:2018.8.3
α-diketones with aldehydes and ketones, leading to an efficient synthesis of a wide range of highly functionalized unsymmetrical epoxides in moderate to excellent yields and diastereoselectivities. The Kukhtin–Ramirez adduct, which is exclusively generated in situ from an α-dicarbonyl compound and P(NMe2)3, plays a key role in governing the chemoselectivity. It represents the first practical synthesis of unsymmetrical
本文中,我们报道了化学选择性P(NMe 2)3介导的α-二羰基化合物(如靛红,α-酮酸酯和α-二酮)与醛和酮的化学还原性环氧化反应,可有效合成多种高度功能化的不对称环氧化物,具有中等至优异的收率和非对映选择性。Kukhtin-Ramirez加合物仅由α-二羰基化合物和P(NMe 2)3原位生成,在控制化学选择性中起关键作用。它代表了通过两种不同的羰基亲电试剂的直接还原环氧化进行不对称环氧化物的首次实际合成,并且补充了现有的生成环氧化物的方法。