| 摘要 |
Preparation of a benzodiazepine-2-alkyl carboxylate derivative of formula (I) to its salt comprises: (i) preparing a compound of formula (VI) by treating a compound of formula (V) with lower alkyl amine in an inert organic solvent; (ii) treating with a halogenating agent; and (iii) cyclising in the presence of a base. R1 = Me, Et or iPr; R2, R3 = H or 1-6C alkyl; R4 = H, halo or CF3; Cc is
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