Soluble poly(ethylene glycol) (PEG)-supported telluride 2 was designed and synthesized for catalytic Wittig-type reactions. It was found that the catalytic loading could be reduced from 20 to 2 mol % by the introduction of PEG (even to 0.5 mol % when some telluride salts were used as the catalyst). Under the catalytic reaction conditions, a wide variety of aldehydes with different structures could
A Novel Olefination of Carbonyl Compounds with Dibromomalonate Promoted by Dibutyl Telluride
作者:Zhang-Lin Zhou、Li-Lan Shi、Yao-Zeng Huang
DOI:10.1080/00397919108019792
日期:1991.4
Abstract α,β-Unstaturated malonic esters are conveniently synthesized from the reaction of dibromomalonate with carbonyl compounds promoted by dibutyltelluride in exellent yields. A possible mechanism involving twice halophilic attacks of dibutyltelluride is proposed. This methodology provides a facile route to α,β-unsaturated malonic esters and represents an alternative to the Knoevenagel reaction