Synthesis of New 2-[(Substituted-pyrazol-1-yl)carbonyl]-thieno[2,3<i>b</i>]pyridine Derivatives Using 1,3-Diketones, Alkylethoxymethylenes and Ketene Dithioacetals
作者:Yuh-Wen Ho
DOI:10.1002/jccs.199900130
日期:1999.12
AbstractThe reaction of 3‐amino‐4,6‐dimethyl‐2‐thieno[2,3‐b]pyridine carbohydrazide (1) with appropriate 1,3‐diketones 2a‐2d in glacial acetic acid afforded 3‐amino‐2‐[(3,5‐disubstituted‐pyrazo)‐1‐yl)carbonyl]‐4,6‐dimethylthieno[2,3‐b]pyridines 3a‐3d. 3‐Amino‐2‐[(5‐amino‐3,4‐disubstituted‐pyrazol‐1‐yl)carbonyl]‐4,6‐dimethylthieno[2,3‐b]pyridines 5a‐5h were also prepared by treatment of carbohydrazide 1 with appropriate alkylethoxymethylenes and ketene dithioacetals 4a‐4h, respectively.