申请人:Roussel Uclaf
公开号:US04670577A1
公开(公告)日:1987-06-02
A novel process for the preparation of pent-4-enoic acids of the formula ##STR1## wherein X is selected from the group consisting of hydrogen, cyano and alkoxycarbonyl of 2 to 5 carbon atoms and Y is selected from the group consisting of hydrogen, cyano, alkoxycarbonyl 2 to 5 carbon atoms, acyl of an organic carboxylic acid of 2 to 7 carbon atoms, alkylsulfonyl of 1 to 4 carbon atoms and arylsulfonyl of 6 to 7 carbon atoms with the proviso that X and Y are not both hydrogen comprising reacting a compound of the formula ##STR2## wherein R is selected from the group consisting of acyloxy of an organic carboxylic acid of 1 to 7 carbon atoms, alkylsulfonyl of 1 to 4 carbon atoms and arylsulfonyl of 6 to 7 carbon atoms with an anion derivative of a compound of the formula ##STR3## wherein X.sub.1 and Y.sub.1 have the above definition for X and Y, respectively, except hydrogen in the presence of a palladium compound or nickel (o) complex and optionally a catalytic quantity of a ligand to obtain a compound of the formula ##STR4## wherein X.sub.1 and Y.sub.1 have the above definition and optionally subjecting the latter to a decarbalkoxylation when X.sub.1 or Y.sub.1 is alkoxycarbonyl or to a reduction when X.sub.1 is arylsulfonyl to obtain the corresponding compound of formula I.
一种用于制备pent-4-enoic酸的新工艺,其化学式为##STR1##其中X从氢、氰基和2到5个碳原子的烷氧羰基中选择,Y从氢、氰基、2到5个碳原子的烷氧羰基、2到7个碳原子的有机羧酸酰基、1到4个碳原子的烷基磺酰基和6到7个碳原子的芳基磺酰基中选择,但X和Y不能同时为氢,包括反应化合物的步骤##STR2##其中R从1到7个碳原子的有机羧酸酰基、1到4个碳原子的烷基磺酰基和6到7个碳原子的芳基磺酰基中选择,与化合物的负离子衍生物##STR3##在钯化合物或镍(o)配合物的存在下,并可选择地加入一个配体的催化量,得到化合物##STR4##其中X.sub.1和Y.sub.1具有上述定义,然后将后者经过脱羧烷基化处理,当X.sub.1或Y.sub.1为烷氧羰基时,或经过还原处理,当X.sub.1为芳基磺酰基时,以得到相应的化合物I的化合物。