A process for preparing a compound of the formula:
wherein R10 is a C3-C21 saturated or monounsaturated, optionally substituted alkyl residue, the process comprising the steps of:
a) reacting a compound of the formula:
wherein R6 and R7 are lower alkyl or benzyl residues, or R6 and R7 taken together are -CH2CH2-, -CH2CH2CH2- or -CH2CH2CH2CH2- with R10COOH or an activated derivative thereof,
wherein R10 is a C3-C21 saturated or monounsaturated, optionally substituted alkyl residue, to provide a compound of the formula:
wherein R6, R7 and R10 are defined as above,
b) de-protecting the acetal of the product of step a), and
c) reducing the aldehyde substituent of the product of step b),
characterized in that the products of steps a) and b) are not isolated.
一种制备式化合物的工艺:
其中R10为C3-C21饱和或单不饱和、任选取代的烷基残基,该工艺包括以下步骤
a)反应式如下的化合物
其中 R6 和 R7 是低级烷基或苄基残基,或 R6 和 R7 合起来是-CH2CH2-、-CH2CH2CH2-或 -CH2CH2CH2-与 R10COOH 或其活化衍
生物反应、
其中 R10 是 C3-C21 饱和或单不饱和、任选取代的烷基残基,以提供式化合物:
其中 R6、R7 和 R10 定义如上、
b) 对步骤 a) 产物的
缩醛进行脱保护,以及
c) 还原步骤 b) 产物中的醛取代基、
其特征在于,步骤 a) 和 b) 的产物不分离。