申请人:Bayer Aktiengesellschaft
公开号:US04910319A1
公开(公告)日:1990-03-20
A process for preparing a 3-amino-1-benzyl-pyrrolidine of the formula ##STR1## in which R.sup.1 and R.sup.2 each independently is H or alkyl, and Ph is phenyl, comprising reacting a 1-benzyl-.DELTA..sup.3 -pyrroline-2,5-dione of the formula ##STR2## in which R.sup.3 and R.sup.4 each independently is H or alkyl, with a nitrogen nucleophile of the formula R.sup.5 NH.sub.2 (III) in which R.sup.5 is H, benzyl, naphthylmethyl or phenyl-CHR.sup.6, and R.sup.6 is C.sub.1 -C.sub.6 -alkyl or phenyl, to give an optionally substituted 3-amino-1-benzylpyrrolidine-2,5-dione of the formula ##STR3## and, if R.sup.5 .noteq.H, the protecting group R.sup.5 is subsequently cleaved off to give a 3-amino-1-benzylpyrrolidine-2,5-dione of the formula ##STR4## and completely reducing the carbonyl groups to form the 3-amino-1-benzylpyrrolidine of the formula (I).
制备式为##STR1##的3-氨基-1-苄基吡咯烷的方法,其中R.sup.1和R.sup.2各自独立地为H或烷基,Ph为苯基,包括将式为##STR2##的1-苄基-.DELTA..sup.3-吡咯啉-2,5-二酮与式为R.sup.5 NH.sub.2 (III)的氮亲核试剂反应,其中R.sup.3和R.sup.4各自独立地为H或烷基,R.sup.5为H,苄基,萘甲基或苯基-CHR.sup.6,R.sup.6为C.sub.1-C.sub.6-烷基或苯基,得到一个可选的取代的式为##STR3##的3-氨基-1-苄基吡咯烷-2,5-二酮,如果R.sup.5 ≠H,则随后去除保护基R.sup.5以得到式为##STR4##的3-氨基-1-苄基吡咯烷-2,5-二酮,并完全还原羰基以形成式为(I)的3-氨基-1-苄基吡咯烷。