α,β-Unsaturated esters from the tri-n-butylarsine-promoted reaction of bromomalonic esters with aldehydes
作者:Yanchang Shen、Baozhen Yang
DOI:10.1016/0022-328x(89)85082-x
日期:1989.10
A convenient synthesis of α,β-unsaturated esters (in 68–96% yields) from the reaction of a bromomalonic ester with aldehydes promoted by tri-n-butylarsine is described. A mechanism involving halophilic attack of tri-n-butylarsine leading to the formation of a salt followed by reaction with carbonylcompounds is proposed. This methodology provides a convenient route to α,β-unsaturated esters and represents
The direct aldol addition of malonates to aromatic, hetero-aromatic and unsaturated aldehydes leading to beta-hydroxymalonates is described. The stability of these products, the trimethyl silyl protection of the hydroxyl group as well as the role of both SiCl4 and i-Pr2EtN in attaining the final products are also discussed. (C) 2009 Elsevier Ltd. All rights reserved.
SHEN, YANCHANG;YANG, BAOZHEN, J. ORGANOMET. CHEM., 375,(1989) N, C. 45-49