申请人:Bayer Aktiengesellschaft
公开号:US04111933A1
公开(公告)日:1978-09-05
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.
在制备具有公式A' -- X的有机化合物的过程中,其中X是氨基、羟基或羧基,而A'是分子的剩余部分,从具有公式A -- X的有机化合物开始,其中A是可以发生反应形成A'的分子的剩余部分,通过将A -- X转化为具有公式A -- Z -- COOR的化合物,其中Z是--NH--、--O--或直接的C--C键,R是具有##STR1##的基团,其中Y是直接的C--C单键,--CH.dbd.CH--基团或芳基基团,R.sup.1到R.sup.4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R.sup.1 + r.sup.2和R.sup.3 + R.sup.4各自独立地完成一个5-或6-成员的碳环,或R.sup.1和R.sup.3与基团--C--Y--C--共同形成具有5或6个碳原子的碳环,Hal是卤素,从而保护X,然后将A -- Z -- COOR转化为具有公式A' -- Z -- COOR的化合物,然后处理化合物A' -- Z -- COOR以恢复基团X,改进包括使用一价钴络合物的碱金属化合物对化合物A' -- Z -- COOR进行处理。该过程特别适用于氨基羧酸,包括青霉素和头孢菌素合成各阶段的中间体。