Selenium-Catalyzed Halolactonization: Nucleophilic Activation of Electrophilic Halogenating Reagents
作者:Shelli R. Mellegaard、Jon A. Tunge
DOI:10.1021/jo048460o
日期:2004.12.1
Diphenyl diselenide catalyzes the halolactonization of unsaturated acids with N-halosuccinimides under mild conditions. The diselenide not only accelerates the reactions, but in some cases affords regiocontrol in favor of gamma-lactone products. Experiments show that the regioselectivity in favor of gamma-lactones is a result of kinetic rather than thermodynamic control.