Stereoselective dehydrobromination of alkyl α-Brα-Cl-carboxylates
作者:Luca Forti、Franco Ghelfi、Ugo M. Pagnoni
DOI:10.1016/0040-4039(95)00416-a
日期:1995.4
(Z)-Alkyl α-Cl-α,β-unsaturated esters are prepared in excellent yields by stereoselective dehydrobromination of alkyl α-Br-α-Cl-carboxylates with LiClLi2CO3 in dimethylformamide.
(Z)-烷基α-Cl-α,β-不饱和酯是通过在二甲基甲酰胺中用LiCl 3 Li 2 CO 3对烷基α-Br-α-Cl-羧酸酯进行立体选择性脱氢溴化而制得的。
An efficient procedure to α-hydroxyaldehyde dimethyl acetals
作者:Monica Boni、Luca Forti、Franco Ghelfi、Ugo M. Pagnoni
DOI:10.1016/s0040-4020(01)85273-x
日期:1994.1
α-Hydroxyaldehyde dimethylacetals are prepared efficiently by conversion of α-haloaldehyde dimethylacetals into α-haloaldehyde hemiacetal acetates and subsequent methanolysis promoted by lithium methoxide.
Ketene Chemistry 2.<sup>1</sup>A General Procedure for the Synthesis of 2-Alkoxycyclopropane-carboxylic Esters and Acids Starting from Aldehydes and Ketene
作者:Preben Bødstrup Rasmussen、Søren Bøwadt
DOI:10.1055/s-1989-27165
日期:——
Alkyl 3-alkoxy-4-bromocarboxylates are prepared by the Lewis acid-catalyzed reaction of α-bromoaldehyde acetals with ketene. Base-catalyzed cyclization of these intermediates affords 2-alkoxycyclopropanecarboxylic esters.