A convenient route for the synthesis of pyrazolo[3,4-<i>d</i>]pyrimidine, pyrazolo[3,4-<i>b</i>][1,6]naphthyridine and pyrazolo[3,4-<i>b</i>]quinoline derivatives
作者:Madhukar N. Jachak、Appasaheb B. Avhale、Vijay J. Medhane、Raghunath B. Toche
DOI:10.1002/jhet.5570430506
日期:2006.9
benzamide 2b gave pyrazolo[3,4-d]pyrimidine derivatives 3. Cyclocondensation of 1 with cyclopentanone, N-benzyl-4-piperidone and 6-methoxy-1-tetralone yielded cyclopenta[b]pyrazolo[4,3-e]pyridines 4, pyrazolo[3,4-b]-[1,6]naphthyridines 5 and benzo[h]pyrazolo[3,4-b]quinolines 6, respectively. Analogous condensation of cyclohexanone 7a or 2-methyl-1-cyclohexanone 7b with 1 afforded pyrazolo[3,4-b]quinoline derivatives
5-氨基吡唑-4-甲醛1与甲酰胺2a或苯甲酰胺2b的Friedländer缩合反应得到吡唑并[3,4- d ]嘧啶衍生物3。的环化缩合1与环戊酮,ñ -苄基-4-哌啶酮和6-甲氧基-1-四氢萘酮,得到环戊二烯并[ b ]吡唑并[4,3- ë ]吡啶4,吡唑并[3,4- b ] - [1,6分别是]萘啶5和苯并[ h ]吡唑并[3,4- b ]喹啉6。环己酮7a的类似缩合或带有1的2-甲基-1-环己酮7b可获得吡唑并[3,4- b ]喹啉衍生物8a-d。用二甲酮提供的吡唑并[3,4- b ]喹啉酮衍生物9加热1。Vilsmeier-Haack的9甲酰化反应产生了两种化合物10和11的混合物。通过将11a,b与苯基肼进行环缩合,进一步获得双吡唑并[3,4- b:4,3- f ]-喹啉12a,b。