Epoxy-sulfonamides react with heterocumulenes (carbon disulfide/isothiocyanates/isocyanates) in the presence of a base to afford ring expansion products in good to high yields with excellent regioselectivity. N-(2-Bromoethyl)-sulfonamides can also be employed as substrates. This reaction proceeds through a 5-exo-tet pathway without forming aziridine intermediates.
环氧磺酰胺在碱的存在下与杂聚
枯烯(
二硫化碳/异
硫氰酸酯/异氰酸酯)反应,以良好的收率和高收率提供极好的区域选择性的扩环产物。N-(2-
溴乙基) -磺酰胺也可以用作底物。该反应通过5 -exo-tet途径进行,而没有形成
氮丙啶中间体。