Room-Temperature Coupling/Decarboxylation Reaction of α-Oxocarboxylates with α-Bromoketones: Solvent-Controlled Regioselectivity for 1,2- and 1,3-Diketones
作者:Zhen He、Xiaotian Qi、Zhijie She、Yinsong Zhao、Shiqing Li、Junbin Tang、Ge Gao、Yu Lan、Jingsong You
DOI:10.1021/acs.joc.6b02575
日期:2017.2.3
A transition-metal-free and room-temperature coupling/decarboxylation reaction between α-oxocarboxylates and α-bromoketones is reported herein. It represents the first mild and regioselective synthesis of either 1,2- or 1,3-diketones from the same starting materials. Notably, the regioselectivity is simply controlled by solvents. The preliminary experimental data and DFT calculations suggest sequential
本文报道了α-氧代羧酸盐和α-溴代酮之间的无过渡金属和室温的偶联/脱羧反应。它代表了从相同原料中首次合成1,2-或1,3-二酮的轻度和区域选择性合成。值得注意的是,区域选择性简单地由溶剂控制。初步的实验数据和DFT计算表明,在一锅中依次进行Darzens型偶联,碱水解,KOH促进的环氧乙烷开口和脱羧反应。该方法对于合成α,β-环氧-γ-丁内酯和姜黄素是有效的。