One Pot Synthesis of Novel Cyanopyridones as an Intermediate of Bioactive Pyrido[2,3-d]Pyrimidines
作者:Taslimahemad T. Khatri、Viresh H. Shah
DOI:10.5012/jkcs.2014.58.4.366
日期:2014.8.20
Synthesis, structural characterization, and biological activity studies of novel pyrido[2,3-d]pyrimidines (10a-h, 11a-h) are described. Cyclization of cynoacetamides (4, 5) with malonitrile (7) and aldehyde (6a-h) via Hantzsch pyridine synthesis afforded cyanopyridones (8a-h, 9a-h), which on cyclization with formic acid under microwave conditions led to the final product. All the reactions are significantly faster and the isolated yields are remarkably higher in microwave conditions compared to the conventionally heated reactions. The compounds were tested in vitro for their antibacterial activity against Escherichia coli, Pseudomonas aeruginosa, Bacillus subtillus, Staphylococcus aureus, and Micrococcus luteus and antifungal activity against Trichphyton longifusus, Candida albicans, Microsporum canis, Fusarium solani. Compounds 10b, 10e, 11b and 11e exhibited good antibacterial and antifungal activities compared with standards.
介绍了新型
吡啶并[2,3-d]
嘧啶(10a-h、11a-h)的合成、结构表征和
生物活性研究。通过 Hantzsch
吡啶合成法,犬喹乙酰胺(4、5)与
丙二腈(7)和醛(6a-h)发生环化反应,得到
氰基吡啶酮(8a-h、9a-h),在微波条件下与
甲酸发生环化反应,得到最终产物。与传统加热反应相比,微波条件下所有反应的速度都明显更快,分离产率也明显更高。这些化合物对大肠杆菌、
铜绿假单胞菌、
枯草芽孢杆菌、
金黄色葡萄球菌和黄体小球菌具有抗菌活性,对长喙毛癣菌、白色念珠菌、犬小孢子菌和茄科镰刀菌具有抗真菌活性。与标准化合物相比,化合物 10b、10e、11b 和 11e 具有良好的抗菌和抗真菌活性。