| 摘要 |
A compound of formula IV wherein G is C1-C12 alkyl, C2-C12 alkenyl, C2-C12 alkynyl or Ar; Ar is an aromatic or heteroaromatic group or a substituted aromatic or heteroaromatic group; R1 is halo, SR, OR, amino, mono or di-(C1-C6-alkyl)amino, tri (C1-C6-alkyl)ammonium, C1-C6-alkylthio, di(C1-C6-alkyl)sulfonium, C1-C6-alkylsulfonyl, or C1-C6-alkylphosphonyl; R2 is OH or SH; or R1 and R2 taken together form a second bond or together form an epoxide, aziridine, episulfide, or cyclopropyl ring; R is H, C1-C6 alkyl, C1-C6 alkanoyl or Ar; R3 is C1-C6 alkyl; R4 and R5 are H; or R4 and R5 taken together form a second bond; R24 is a leaving group; and R26 is an alcohol protecting group; X is O, NH or (C1-C3 alkyl)N-.
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