Synthesis of 3-HCF<sub>2</sub>S-Chromones through Tandem Oxa-Michael Addition and Oxidative Difluoromethylthiolation
作者:Pingshun Zhang、Wanzhi Chen、Miaochang Liu、Huayue Wu
DOI:10.1021/acs.orglett.9b03396
日期:2019.12.6
A simple protocol for the synthesis of difluoromethylthiolated chromen-4-ones using elemental sulfur and ClCF2CO2Na as the difluoromethylthiolating agent is described. Three-component reactions of 2'-hydroxychalcones, ClCF2CO2Na, and sulfur under basic conditions using TEMPO as the oxidant afforded HCF2S-containing 4H-chromen-4-one and 9H-thieno[3,2-b]chromen-9-one derivatives in good yield. The protocol
描述了一种使用元素硫和ClCF2CO2Na作为二氟甲基硫醇化试剂合成二氟甲基硫醇化chromen-4-ones的简单方案。在碱性条件下,使用TEMPO作为氧化剂,在2'-羟基查耳酮,ClCF2CO2Na和硫的三组分反应下,可得到含HCF2S的4H-色烯-4-酮和9H-硫代[3,2-b]铬-9-酮衍生物产量高。该方案是实用且有效的,并且起始材料便宜且容易获得。