Regioselectivity in nickel(0)/phosphine catalyzed cycloadditions of alkynes and isocyanates
作者:Hung A. Duong、Janis Louie
DOI:10.1016/j.jorganchem.2005.03.027
日期:2005.11
The regioselectivity of Ni(0)-catalyzed cycloadditions of various isocyanates and asymmetrical alkynes to afford pyridones was explored. The use of PEt3 provided, in most cases, two of the four possible pyridone regioisomers in high overall yields. Mechanistic rationale for the product distribution is provided.
探索了Ni(0)催化的各种异氰酸酯和不对称炔烃提供吡啶酮的环加成反应的区域选择性。在大多数情况下,使用PEt 3可以以较高的总收率提供四种可能的吡啶酮区域异构体中的两种。提供了产品分配的机械原理。