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).
结果表明,在Bu 3 N和2-氯-1-甲基吡啶碘化物在甲苯或CH 2 Cl 2中的存在下,羧酸与[(烷氧基羰基)亚甲基]膦酸酯反应生成相应的烯丙基羧酸酯( ef。方案1和表1)。该方法也可用于肉桂酸,其以低收率形成[3]枯烯基羧酸盐(表3)。在相同条件下,可以将4-甲基-2-戊酸转化为(2E)-4-氯-2,6-二甲基庚-2,4,5-三烯酸酯(方案4)。