Enaminones as Building Blocks in Heterocyclic Preparations: Synthesis of Novel Pyrazoles, Pyrazolo[3,4-d]pyridazines, Pyrazolo[1,5-a]pyrimidines, Pyrido[2,3-d]pyrimidines Linked to Imidazo[2,1-b]thiazole System
作者:Sobhi M. Gomha、Hatem A. Abdel-Aziz
DOI:10.3987/com-12-12531
日期:——
have been utilized extensively in this decade as building blocks in organic synthesis. Furthermore, many enaminones were found to exhibit several biological activities as antitumor, antibacterial and anticonvulsant agents. On the other hand, imidazoles possess important biological, pharmacological and therapeutic activities, where midazoles are present in compounds that have antiasthmatic, anti-inflammatory
未报道的2-[E-3-(N,N-二甲基氨基)丙烯酰基]-3-甲基-5,6二苯基咪唑并[2,1-b]噻唑3由2-乙酰基-3甲基-5,6反应制备-二苯基咪唑并[2,1-b]噻唑 2 与二甲基甲酰胺二甲基缩醛 (DMF-DMA)。烯胺酮 3 与腈亚胺 5a-f 进行区域选择性 1,3-偶极环加成反应,得到相应的吡唑 7a-f。7a,d,g 与水合肼反应分别得到吡唑并[3,4d]哒嗪类化合物 8a-c。烯胺酮 3 还与肼、盐酸羟胺、5-氨基吡唑 11、6-氨基硫氧嘧啶 15 和马尿酸 22 反应。新合成的化合物的结构通过光谱数据和元素分析得到证实。烯胺酮是多齿试剂,在这十年中已被广泛用作有机合成的组成部分。此外,许多烯胺酮被发现具有多种生物活性,可作为抗肿瘤、抗菌和抗惊厥剂。另一方面,咪唑具有重要的生物学、药理和治疗活性,其中咪唑存在于具有抗哮喘、抗炎、抗溃疡、抗血栓、杀真菌和除草活性的化合物中。此外,一些咪唑并[2