propargylic mesylates with thiols and carbon monoxide has been developed by the use of tetrakis(triphenylphosphine)palladium(0) as the catalyst at 90 °C in THF. The reaction affords the corresponding dithioesters in good to excellent yields. For some secondary and tertiary propargylic alcohols with a terminal or internal triple bond, the reaction stereoselectively produces E-dithioesters as products. The dithiocarbonylation
丙炔基
甲磺酸酯与巯基和
一氧化碳的高度立体选择性二
硫羰基化反应已通过使用四(
三苯基膦)
钯(0)作为催化剂在90°C的THF中进行开发。该反应以良好至优异的产率提供了相应的二
硫酯。对于某些具有末端或内部三键的仲和叔炔
丙醇,该反应立体选择性地产生作为产物的E-二
硫酯。据信二
硫羰基化反应是通过烯丙基
钯和烯丙基酯中间体进行的,并且高立体选择性可以通过一种机理来合理化,其中Pd(0)L n物质对烯丙基sp碳的亲核攻击是从烷基取代基的较少受阻侧发生的。