Iodine-Catalyzed Intramolecular Oxidative Thiolation of Vinylic Carbon-Hydrogen Bonds<i>via</i>Tandem Iodocyclization and Dehydroiodination: Construction of 2-Methylene-3-thiophenones
作者:Gang Zheng、Xiaoli Ma、Bangyu Liu、Ying Dong、Mang Wang
DOI:10.1002/adsc.201300815
日期:2014.3.10
A metal‐free vinylic carbon‐hydrogen bond thiolation has been developed. Under the catalysis of iodine (10 mol%), the cyclization of α‐alkenoyl ketene dithioacetals afforded a broad range of polyfunctionalized 2‐methylene‐3‐thiophenones in good selectivity with moderate to excellent yields via tandem iodocyclization and dehydroiodination. The synthetic strategy can also be extended to the cyclization
已开发出一种无金属的乙烯基碳氢键硫醇化剂。在碘(10 mol%)的催化下,通过串联碘代环化和脱氢加碘作用,α-链烯基烯酮二硫缩醛的环化反应提供了广泛的多官能化2-亚甲基-3-噻吩酮,选择性好,产率中等至优异。合成策略还可以扩展到邻甲基苯硫基乙烯基酮的环化反应,生成2-亚甲基-3-苯并噻吩酮。