| 摘要 |
<p>PCT No. PCT/FR96/01349 Sec. 371 Date Mar. 3, 1998 Sec. 102(e) Date Mar. 3, 1998 PCT Filed Apr. 9, 1996 PCT Pub. No. WO97/09303 PCT Pub. Date Mar. 13, 1997An alpha -hydrazino acid derivative of general formula (I) is described, wherein R1, R2, R3 are hydrogen or a carbon radical, such that when R2 and R3 are different, C* is an asymmetric carbon of L, D or DL configuration, and R4 and R5 are a protecting group, characterized in that R4 is a benzyl ArCH2 radical of formula (a), wherein Ar is a phenyl radical or phenyl substituted by one or more X groups; X being hydrogen, halogen, a nitro or alkyl radical; and in that R5 is a Y-O-CO group, where Y is a carbon radical different from R4.</p> |
