Synthesen von 2-Pyronen aus ?, ?-unges�ttigten S�urechloriden und terti�ren Aminen
作者:M. Rey、E. Dunkelblum、R. Allain、Andr� S. Dreiding
DOI:10.1002/hlca.19700530829
日期:——
A new synthesis of 2-pyrones has been developed. Two molecules of α, β-unsaturated acid chlorides (8, 12 and 18) condense, with loss of two molecules hydrogen chloride, to pairs of substituted 2-pyrones (9 and 10, 13 and 14, 19 and 20) when treated with triethyl amine in chloroform or methylene chloride at room temperature. In the case of 18, two additional products were obtained, namely the resorcinol