| 摘要 |
The title compds. (I or II; R1=H, halo, NH2, alkyl, CF3, alkoxy, OH; R2=lower alkyl, acetyl, CF3CO, Ph, substituted Ph; R3=H, lower alkanoyl; X=CH, N; Y=CF3CO2, halide; the dotted lines-optional double bonds in the 5,6 and 7,8 positions) were prepd. Thus, 10.75g α-bromophenyl acetic acid contg. 10.25g 5-chloro-2-mercaptobenzothiazole, 100mL glacial acetic acid, and 30mL acetic acid was boiled to give 16g 6-chloro-3-hydroxy-2-phenylthiazolo [2,3-b -benzothiazoliumBr.
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