| 摘要 |
PCT No. PCT/EP94/00694 Sec. 371 Date Sep. 6, 1995 Sec. 102(e) Date Sep. 6, 1995 PCT Filed Mar. 8, 1994 PCT Pub. No. WO94/21609 PCT Pub. Date Sep. 29, 1994A process for the preparation of a compound of formula (I) <IMAGE> (I) <IMAGE> (II) in which R3 is hydrogen, C1-6 alkyl or C1-6 alkylaryl, by reduction using diborane, of a compound of Formula (II) in which R3 is as defined in relation to formula (I) and R4 is C1-6 alkyl. |
