申请人:Janssen Pharmaceutica, N.V.
公开号:US06018043A1
公开(公告)日:2000-01-25
The subject invention concerns a process for preparing a compound of formula (3) ##STR1## in enantio-enriched form, comprising reducing a compound of formula (4) ##STR2## using an asymmetric enantiospecific reductant, wherein A.sup.1 .dbd.A.sup.2 .dbd.H or A.sup.1, A.sup.2 .dbd.O; B.sup.1 .dbd.B.sup.2 .dbd.H or B.sup.1, B.sup.2 .dbd.O; Z.dbd.H, C.sub.1-20 alkyl or a precursor thereof, or a removable protecting group for nitrogen, e.g, acyl or alkyloxycarbonyl; Y.dbd.H or a substituent; R.sup.1 .dbd.C.sub.1-20 alkyl; and R is an optional, additional substituent.
本发明涉及一种制备式(3)化合物的方法,其为对映富集形式,包括使用不对称对映选择性还原剂还原式(4)化合物,其中A.sup.1.dbd.A.sup.2.dbd.H或A.sup.1,A.sup.2.dbd.O;B.sup.1.dbd.B.sup.2.dbd.H或B.sup.1,B.sup.2.dbd.O;Z.dbd.H,C.sub.1-20烷基或其前体,或用于氮的可移除保护基,例如酰基或烷氧羰基;Y.dbd.H或取代基;R.sup.1.dbd.C.sub.1-20烷基;R是可选的附加取代基。