Isolable Gold(I) Complexes Having One Low-Coordinating Ligand as Catalysts for the Selective Hydration of Substituted Alkynes at Room Temperature without Acidic Promoters
作者:Antonio Leyva、Avelino Corma
DOI:10.1021/jo802558e
日期:2009.3.6
Hydration of a wide range of alkynes to the corresponding ketones has been afforded in high yields at room temperature by using gold(I)−phosphine complexes as catalyst, with no acidic cocatalysts required. Suitable substrates covering alkyl and aryl terminal alkynes, enynes, internal alkynes, and propargylic alcohols, including enantiopure forms, are cleanly transformed to the corresponding ketones
通过使用金(I)-膦配合物作为催化剂,无需酸性助催化剂,即可在室温下高收率地将各种炔烃水合为相应的酮。覆盖烷基和芳基末端炔烃,烯炔,内部炔烃和炔丙醇的合适底物,包括对映体纯形式,以接近定量的收率干净地转化为相应的酮。保留存在于底物中的酸不稳定基团。催化活性强烈取决于与金(I)中心配位的膦的性质以及抗衡阴离子AuSPhosNTf 2的柔软度显示更好的活动。在动力学研究的基础上,提出了一种可行的炔烃通过缩酮中间体水合的机理。所描述的催化系统应提供基于汞的方法的有效替代方法,并在合成程序中有用。