| 摘要 |
Title compds. [I; R1 = H, C1-4 alkyl; R2 = H, Me, COOH; A = pyridyl, benzodioxanyl, R3R4R5C6H2( R3,R4,R5 = H, halo, OH, alkoxy, alkyl, alkoxycarbonyl, dialkylamino, carboxamide, NO2, CN, morpholino, piperidino, hydroxypiperidino, Ph ) having antiallerigic activity, were prepd. by reaction of II and oxalic acid ester halide or dialkyloxalate. Thus, 6 g II (A = 2,5-(MeO)2C6H3; R3 = H) were stirred with 2.9 g ClCOCOOEt in pyridine for 2.5 hr to give 4.2 g I(m.p., 118-122≦̸C).
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