Zirconocene-catalyzed kinetic resolution of dihydrofurans
摘要:
Zisconocene-catalyzed kinetic resolution of dihydrofurans may be effected in the presence of 10 mol% non-racemic (EBTHI)ZrCl2. Transformations reported herein proceed efficiently to afford two constitutionally distinct and readily separable products with excellent levels of diastereo- and enantioselectivity. Preparation and resolution of the substrate furans may be carried out in a single pot.
Allylation Reactions of Aldehydes with Allylboronates in Aqueous Media: Unique Reactivity and Selectivity that are Only Observed in the Presence of Water
Zn(OH)2‐catalyzed allylation reactions of aldehydes with allylboronates in aqueous media have been developed. In contrast to conventional allylboration reactions of aldehydes in organic solvents, the α‐addition products were obtained exclusively. A catalytic cycle in which the allylzinc species was generated through a B‐to‐Zn exchange process is proposed and kinetic studies were performed. The key
Zirconocene-catalyzed kinetic resolution of dihydrofurans
作者:Michael S. Visser、Amir H. Hoveyda
DOI:10.1016/0040-4020(94)01127-l
日期:1995.4
Zisconocene-catalyzed kinetic resolution of dihydrofurans may be effected in the presence of 10 mol% non-racemic (EBTHI)ZrCl2. Transformations reported herein proceed efficiently to afford two constitutionally distinct and readily separable products with excellent levels of diastereo- and enantioselectivity. Preparation and resolution of the substrate furans may be carried out in a single pot.