Pyrazolo[3,4-<i>b</i>]pyridine in heterocyclic synthesis: synthesis of new pyrazolo[3,4-<i>b</i>]pyridines, imidazo[1',2':1,5]pyrazolo[3,4-<i>b</i>]pyridines, and pyrido[2',3':3,4]pyrazolo[1,5-<i>a</i>]pyrimidines
作者:Mohamed A.M Gad-Elkareem、Azza M Abdel-Fattah、Mohamed A.A Elneairy
DOI:10.1139/v07-089
日期:2007.9.1
Pyrazolo[3,4-b]pyridine derivatives 7 and 9 were synthesized via the reaction of 3-amino-1H-pyrazolo-[3,4-b]pyridine derivative 2 with ω-bromoacetophenones. Reaction of 7 and 9 with Ac2O afforded the imidazo[1',2':1,5]py razolo[3,4-b]pyridine derivative 8 and pyrazolo[3,4-b]pyridine derivative 10, respectively. Reaction of 2 with chloroacetonitrile followed by DMF-DMA gave imidazo[1',2':1,5]pyrazolo[3
吡唑并[3,4-b]吡啶衍生物7和9是通过3-氨基-1H-吡唑并-[3,4-b]吡啶衍生物2与ω-溴苯乙酮的反应合成的。7和9与Ac2O反应分别得到咪唑并[1',2':1,5]py唑并[3,4-b]吡啶衍生物8和吡唑并[3,4-b]吡啶衍生物10。2 与氯乙腈反应,然后是 DMF-DMA,分别得到咪唑并 [1',2':1,5] 吡唑并 [3,4-b] 吡啶 4 和 5。乙酰丙酮和 1,1-二氰基-2,2-二甲基硫乙烯与 2 反应,分别得到吡啶并[2',3':3,4]吡唑并-[1,5-a]-嘧啶 11 和 14。此外,2 与 DMF-DMA 反应生成甲脒 15,后者又与活性亚甲基试剂反应,生成相应的吡啶并 [2',3':3,4] 吡唑并 [1,5-a] 嘧啶 18 和23a-23d. 关键词:1H-吡唑啉[3,