A Short Synthesis of Allene- and [3] Cumulenecarboxylates
作者:Elisabeth Kohl-Mines、Hans-J�rgen Hansen
DOI:10.1002/hlca.19850680819
日期:1985.12.18
[(alkoxycarbonyl)methylidene]phosphoranes to yield the corresponding esters of allene carboxylic acids (ef. Scheme 1 and Table 1). This procedure can also be applied to cinnamic acids which form [3]cumulenecarboxylates in low yield (Table 3). Under the same conditions 4-methyl-2-pentynoic acid can be transformed into (2E)-4-chloro-2,6-dimethylhepta-2,4,5-trienoate (Scheme 4).