The reaction of dialkyl acetals derived from α,β-unsaturated aldehydes with Grignard reagents using TiCl4in THF afforded the cross coupling products, allyl ethers, in high yields. The TiCl4-promotedreaction of alkyl 2,4-dichlorophenyl acetals, synthesized from 3,4-dihydro-2H-pyran or ethyl vinyl ether and 2,4-dichlorophenol, with Grignard reagents in THF at low temperature afforded the corresponding
Direct anomeric substitution of pyranyl esters using organocopper reagents
作者:V. Bolitt、C. Mioskowski、J.R. Falck
DOI:10.1016/s0040-4039(01)93845-6
日期:1989.1
2-Substituted tetrahydropyrans were obtained by direct anomeric substitution of tetrahydropyranyl 2,4-dimethoxybenzoate, using Grignard-derived organocopperreagents.