Direct transformation of allylic and benzylic alcohols or their silylated derivatives into organolithium compounds
摘要:
The reaction of allylic or benzylic alcohols 1 with n-butyllithium followed by treatment with lithium powder and a catalytic amount of DTBB (5 mol %) in THF at room temperature gives a solution of the corresponding alkyllithium reagent, which reacts in situ with different electrophiles to yield the expected products 2. Alternatively, the O-silylated derivatives of the same alcohols are lithiated under Barbier-type reaction conditions to afford the same reaction products with better yields.
Direct transformation of allylic and benzylic alcohols or their silylated derivatives into organolithium compounds
作者:Emma Alonso、David Guijarro、Miguel Yus
DOI:10.1016/0040-4020(95)00709-h
日期:1995.10
The reaction of allylic or benzylic alcohols 1 with n-butyllithium followed by treatment with lithium powder and a catalytic amount of DTBB (5 mol %) in THF at room temperature gives a solution of the corresponding alkyllithium reagent, which reacts in situ with different electrophiles to yield the expected products 2. Alternatively, the O-silylated derivatives of the same alcohols are lithiated under Barbier-type reaction conditions to afford the same reaction products with better yields.
Highly selective oxidation of organosilanes with a reusable nanoporous silver catalyst
Room temperature highlyselectiveoxidation of organosilanes to organosilanols and organosilyl ethers is achieved in liquid-phase with dealloyed nanoporous silver catalysts. In both cases, aromatic and aliphatic silanes can be effectively converted into the corresponding silanols and silyl ethers by using water and alcohols as oxidant, respectively. Moreover, hydrogen gas is the only by-product and