Sila-Morita−Baylis−Hillman Reaction of Arylvinyl Ketones: Overcoming the Dimerization Problem
摘要:
Arylvinyl ketones, under Morita-Baylis-Hillman (MBH) reaction conditions, produce a mixture of dimerization products. We propose a solution to this problem: a sila-MBH reaction. This cascade reaction involves addition of phosphine catalyst to arylvinyl ketones, trapping of the forming beta-sllylenolate with aldehyde, followed by a 1,3-Brook rearrangement to give the Si-MBH adducts in good to excellent yields.
作者:Juma’a R Al Dulayymi、Mark S Baird、Helmi H Hussain、Baker J Alhourani、Al-Meqdad Y Alhabashna、Simon J Coles、Michael B Hursthouse
DOI:10.1016/s0040-4039(00)00566-9
日期:2000.5
A number of 1- and 1,2-disubstituted cyclopropenes undergo [4+2]-cycloaddition to methyl vinyl ketone or acrolein at ambient temperature to produce 2-oxabicyclo[4.1.0]hept-3-enes. When 1-phenyl-2-trimethylsilyl-cyclopropene is treated with 0.4 mol. equiv. of m-chloroperbenzoic acid, the derived ring-opened enone undergoes [4+2]-cycloaddition to the remaining starting material at ambient temperature