Ynolates were found to react with alpha-alkoxy-, alpha-siloxy-, and alpha-aryloxyketones at room temperature to afford tetrasubstituted olefins with high Z selectivity. Since the geometrical selectivity was determined in the ring opening of the beta-lactone enolate intermediates, the torquoselectivity was controlled by the ethereal oxygen atoms. From experimental and theoretical studies, the high Z
Anodic synthesis of butenolides from β-ethylenic esters double cyclization in the presence of olefins
作者:J. Delaunay、A. Orliac-Lemoing、J. Simonet
DOI:10.1016/s0040-4020(01)86077-4
日期:1988.1
Anodic oxidation of β-ethylenic esters yields butenolides . In the presence of 1-phenyl-1-propene or α,β-disubstituted indenones a double cyclization takes place to yield more complex butenolides
The Baeyer–Villiger oxidation represents a valuable reaction that enables the conversion of ketones into esters or lactones. Here, we present a novel and efficientapproach utilizing I2 as a catalyst for the oxidative rearrangement of cyclobutenones, resulting in the synthesis of furan-2(5H)-one. Notably, this method employs dimethyl sulfoxide (DMSO) as a greener oxidant and source of oxygen. The reaction
拜尔-维利格氧化是一种有价值的反应,可以将酮转化为酯或内酯。在这里,我们提出了一种新颖且有效的方法,利用 I 2作为环丁烯酮氧化重排的催化剂,从而合成呋喃-2(5 H )-酮。值得注意的是,该方法采用二甲亚砜 (DMSO) 作为更环保的氧化剂和氧源。在催化量的碘的作用下,反应顺利进行,以良好的产率产生内酯。与依赖过酸或过氧化氢的传统拜尔-维利格氧化反应相比,DMSO 的使用提供了更安全、更通用的替代方案。