申请人:BIOGAL GYOGYSZERGYAR
公开号:EP0578850A1
公开(公告)日:1994-01-19
The subject matter of the invention is a process for the preparation of carboxylic acids and derivatives of them of the general formula
wherein
Rmeans hydrogen, or a C₁₋₄alkyl or a (C₁₋₅alkoxy)carbonyl group,
R₁is as defined in claim 1,
R₇stands for hydrogen or a C₁₋₇alkyl group and
R₈means hydrogen or a carboxyl group,
by reacting a 1,3-dioxane-4,6-dione derivative of the general formula
wherein
R₉stands for a C₁₋₄alkyl group or a phenyl group, optionally monosubstituted by halogen and
R₁₀stands for hydrogen or a C₁₋₅alkyl group or
R₉ and R₁₀together form a pentamethylene group,
and an aldehyde or ketone of the general formula
in the presence of formic acid and of [a] amine(s) and, if desired, of an alcohol of the general formula
R₇ - OH VI,
wherein
R₇is a C₁₋₇alkyl group,
at a temperature of 20 to 140°C,
and/or
reducing an unsaturated 1,3-dioxane-4,6-dione derivative of the general formula
and/or
a 1,3-dioxane-4,6-dione derivative of the general formula
with formic acid in the presence of [a] amine(s) and, if desired, of an alcohol as above defined.
本发明的主题是一种用于制备通式为的羧酸及其衍生物的过程
其中
R表示氢,或C₁₋₄烷基或(C₁₋₅烷氧基)甲酰基,
R₁如权利要求1中定义,
R₇代表氢或C₁₋₇烷基团和
R₈表示氢或羧酸基,
通过将通式为的1,3-二氧杂环己烷-4,6-二酮衍生物与醛或酮反应
其中
R₉代表C₁₋₄烷基或苯基,可选地由卤素单取代
R₁₀代表氢或C₁₋₅烷基或
R₉和R₁₀共同形成一个戊烷基,
在甲酸和[a]胺的存在下,如果需要,还可以在上述定义的醇的存在下,
R₇ - OH VI,
其中
R₇是C₁₋₇烷基,
在20至140°C的温度下,
和/或
将通式的不饱和1,3-二氧杂环己烷-4,6-二酮衍生物还原
和/或
通式为的1,3-二氧杂环己烷-4,6-二酮衍生物
与甲酸在[a]胺的存在下,如果需要,还可以在上述定义的醇的存在下。