Reaction of α-bromomethylacrylic acid with aldehydes or ketones in an SnCl2/amberlyst 15/THF/H2O system affords 2-methylene-4-alkanolides in mostly good yields.
A New Approach for the Synthesis of α-Methylene-γ-Butyrolactones from α-Bromomethyl Acrylic Acids (or Esters)
作者:Jing-yao Zhou、Guo-di Lu、Shi-hui Wu
DOI:10.1080/00397919208019246
日期:1992.2
Abstract This paper reports that a new approach for the synthesis of α-methylene-γ-butyrolactones from the reaction of α-bromomethyl acrylic acid (or ester), powdered tin and carbonyl compounds in one pot with excellent to good yields.
Lead-Promoted 2-Carboethoxyallylation or 2-Carboxylallylation of Aldehydes: A New and Facile Method for the Synthesis of α-Methylene-γ-Butyrolactones
作者:Jing-Yao Zhou、Yu Jia、Xu-Bo Yao、Shi-Hui Wu
DOI:10.1080/00397919608004550
日期:1996.6
(or α-bromomethylacrylic acid) can be carried out under mild condition, the products 4-hydroxy-2-methylenebutanoates (or 4-hydroxy-2-methylenebutanoic acids) can be easily converted to α-methylene-γ-butyrolactones in the presence of CF3COOH.