| 摘要 |
Title cpds. formula (I) (where R is H or 1-4C alkyl, R1 is H, 1-4C alkyl opt. substd. by OH, 3-5C alkenyl, opt. substd. carbamoy-: loxyalkyl, acyl, amidino or opt. substd. carbamoyl, and R2 is H, NO2, NH2 acylamino or halogen in the 7- or 8-posn) are prepd. by cyclisation of a cpd. (II) (where R3 is alkyl or aralkyl) in the presence of a base and opt. hydrolysis (I; R1 = COOR3) or by nitrating (I; R2 = H) reducing nitro to amino and acylating amino or replacing by halogen.
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