| 摘要 |
A process comprising subjecting a propionamide derivative of the formula (I): (see formula) wherein Ring A and Ring B are substituted or unsubstituted benzene, R1 and R2 are the same or different and each are H, carbamoyl, lower alkyl, lower alkanoyl, a lower alkylaminocarbonyl, or amino acid residue, or combine each other at their termini together with the adjacent nitrogen atom to which they bond to form a heterocyclic group having optionally a substituent, R3 is H, dilower alkylamino-lower alkyl or substituted or unsubstituted piperazinyl-lower alkyl, to intramolecular cyclization reaction in the presence or absence of acid or base.
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