溶剂的性质是 ( E )-β-碘乙烯基砜在碱性条件下与硫醇进行立体选择性单硫醇化和双硫醇化的关键因素。提出了一种在室温下在K 2 CO 3 /DMSO 的影响下将 ( E )-β-碘乙烯基砜与硫醇进行新型且前所未有的邻位双硫醇化反应,以快速组装 ( E )-1,2-dithio-1-alkenes。溶剂诱导的 ( E )-β-碘乙烯基砜与硫醇的立体选择性单磺酰化也已被建立,用于分别在 MeCN 和 MeOH 中合成 ( E )-和 ( Z )-1,2-硫代磺酰基乙烯。此外,K 2 CO 3介导的 ( Z )-1,2-硫代磺酰基乙烯在 DMSO 中与硫醇的脱磺酰化-亚磺酰化反应首次提供了不对称的 ( Z )-1,2-dithio-1-alkenes。( E )-β-碘乙烯基砜的溶剂依赖性多功能反应性已被成功探索,以提供一组 ( E )-/( Z )-1,2-dithio-1-alkenes 和
Iodine-Promoted Deoxygenative Iodization/Olefination/Sulfenylation of Ketones with Sulfonyl Hydrazides: Access to β-Iodoalkenyl Sulfides
作者:Yishu Bao、Xiuqin Yang、Qingfa Zhou、Fulai Yang
DOI:10.1021/acs.orglett.8b00511
日期:2018.4.6
stereoselective synthesis of β-haloalkenyl sulfides using commercially available ketones and sulfonyl hydrazides as starting materials has been developed. This protocol obviates the need for alkynes and traditional sulfenylating agents and therefore opens up a new door to construct β-iodoalkenyl sulfides in a highly simple manner. This study reveals that ketones could be used as vinyl iodide precursors
Treatment of diphenyl disulfide and terminal alkynes with gallium trichloride afforded (E)-1,2-diphenylthio-1-alkenes selectively (E/Z > 20/1). Alkenes also underwent this reaction to form trans adducts.