In the process for preparing an organic compound of the formula A' -- X in which X is an amino group, a hydroxyl group or a carboxyl group, and A' is the remainder of the molecule, from an organic compound of the formula A -- X in which A is the remainder of the molecule which can undergo reaction to form A', by converting A -- X into a compound of the formula A -- Z -- COOR in which Z is --NH--, --O-- or a direct C--C bond, and R is a radical of the formula ##STR1## IN WHICH Y is a direct C--C single bond, the --CH.dbd.CH-- group or an arylene group, R.sup.1 to R.sup.4 each independently is hydrogen, halogen or an alkyl, aryl, aralkyl, alkoxycarbonyl, alkylaminocarbonyl, arylaminocarbonyl or cycloalkylaminocarbonyl radical, or R.sup.1 + r.sup.2 and R.sup.3 + R.sup.4 each independently completes a 5- or 6-membered carbocyclic ring, or R.sup.1 and R.sup.3 conjointly with the grouping --C--Y--C-- forms a carbocyclic ring with 5 or 6 carbon atoms, and Hal is halogen, Thereby to protect X, then converting A -- Z -- COOR into a compound of the formula A' -- Z -- COOR and then treating the compound A' -- Z -- COOR to restore the group X, the improvement which comprises effecting the treatment of the compound A' -- Z -- COOR with an alkali metal compound of a complex of monovalent cobalt. The process is applicable particularly to aminocarboxylic acids including intermediates from various stages of the synthesis of penicillins and cephalosporins.
在制备分子式为A'-X的有机化合物的过程中,其中X是
氨基、羟基或羧基,A'是分子的余下部分。从分子式为A-X的有机化合物中制备,其中A是可以经历反应形成A'的分子余下部分,通过将A-X转化为分子式为A-Z-COOR的化合物,其中Z是-NH-、-O-或直接的C-C键,R是以下式子的基团:##STR1## 其中Y是直接的C-C单键,-CH=CH-基团或芳基基团,R1至R4各自独立地是氢、卤素或烷基、芳基、芳基烷基、烷氧羰基、烷基
氨基羰基、芳基
氨基羰基或环烷基
氨基羰基基团,或R1+R2和R3+R4各自独立地完成一个5-或6元环的碳环,或R1和R3与基团-C-Y-C-共同形成一个含有5或6个碳原子的碳环,Hal是卤素,以保护X,然后将A-Z-COOR转化为式为A'-Z-COOR的化合物,然后处理化合物A'-Z-COOR以恢复基团X,改进的方法包括使用一价
钴络合物的碱
金属化合物处理化合物A'-Z-COOR。该过程特别适用于
氨基
羧酸,包括
青霉素和
头孢菌素合成的各个阶段的中间体。