A simple and efficient synthesis of norbixin and crocetin diesters is described following the schemes C2 + C2o + C2,=C24 and C3 + C14 + C3 = C20 respectively. By means of the Wittig reaction crocetin di-aldehyde is condensed with a bromoacetic acid ester and a C14-dialdehyde with an α-bromopropionic acid ester. The intermediate tri- phenylphosphorane compounds are crystalline and easily isolated in
分别按照方案C 2 + C 2o + C 2,= C 24和C 3 + C 14 + C 3= C 20,描述了降bi素和藏红花二酯的简单而有效的合成。通过维蒂希反应,将
藏红花酸二醛与
溴乙酸酯缩合,并将C 14-二醛与α-
溴丙酸酯缩合。中间体三苯基
磷烷化合物是晶体,容易以纯净状态分离。