An efficient aerobic iron-catalyzed annulation of unsaturated carboxylic acids with disulfides has been developed. This procedure proceeds using FeCl3 as the catalyst and KI as an iodine source under an air atmosphere, which provides practical access to a wide range of substituted γ-lactone derivatives. The disclosed method is quite simple, highly atom-economic, environmentally friendly, and tolerates
已开发出一种有效的好氧铁催化不饱和羧酸与二硫化物的环化。该过程在空气气氛下使用 FeCl 3作为催化剂和 KI 作为碘源进行,这为获得广泛的取代 γ-内酯衍生物提供了实用的途径。所公开的方法非常简单,原子经济性高,环境友好,并且可以容忍广泛的底物范围。
A Novel Method for the Chlorolactonization of Alkenoic Acids Using Diphenyl Sulfoxide/Oxalyl Chloride
作者:Rui Ding、Liyuan Lan、Shuhui Li、Yongguo Liu、Shaoxiang Yang、Hongyu Tian、Baoguo Sun
DOI:10.1055/s-0037-1609687
日期:2018.7
Abstract A facile chlorolactonization of alkenoicacids by treatment with diphenyl sulfoxide/oxalyl chloride has been developed. The reaction can generate various chlorolactones in moderate to good yields, wherein the chlorodiphenylsufonium salt derived from diphenyl sulfoxide/oxalyl chloride serves as the source of Cl+. A facile chlorolactonization of alkenoicacids by treatment with diphenyl sulfoxide/oxalyl
Stereoselective synthesis of 3,4-di-substituted mercaptolactones via photoredox-catalyzed radical addition of thiophenols
作者:Farzana Kouser、Vijay Kumar Sharma、Masood Rizvi、Shaista Sultan、Neha Chalotra、Vivek K. Gupta、Utpal Nandi、Bhahwal Ali Shah
DOI:10.1016/j.tetlet.2018.04.046
日期:2018.5
A visible light mediated radical addition of thiophenols on 4-phenylbut-3-enoic acids to give diastereoselective synthesis of 3,4-disubstituted γ-lactones is reported. The reaction precludes the conventional prerequisite of conjugate addition. Furthermore, the lactones were successfully utilized in the synthesis of γ-ketoamides.