Stereochemical investigation in the 1,3-dipolar cycloadditions of 3-nitro-2-phenyl-2H-1-benzopyrans to diazoalkanes: Synthesis and antimicrobial activity of novel benzopyranopyrazole derivatives
作者:Ram Prasad K. Kodukulla、S. Hariharan、Girish K. Trivedi
DOI:10.1016/s0040-4020(01)85003-1
日期:1994.4
various benzopyranopyrazole derivatives namely [1,9-b]dihydro-3a- nitro-4-phenyl[1]benzopyrano[3,4-c]pyrazolines(4a-h), 4-phenyl[1]benzopyrano [3,4-c]pyrazoles (5a-h) and [1,9-b]dihydro-1-methyl-3a-nitro-4-phenyl[1]benzopyrano[3,4-c]pyrazolines (6a-h) respectively. The regio and stereochemical outcome of these cycloadditions are discussed. The benzopyranopyrazole derivatives 4a-h and 6-ah were tested
制备了一系列3-硝基-2-苯基-2H-1-苯并吡喃(3a-h),并用重氮甲烷和重氮乙烷处理,得到了各种苯并吡喃并吡唑衍生物,即[1,9-b]二氢-3a-硝基-4-苯基[1]苯并吡喃并[3,4-c]吡唑啉(4a-h),4-苯基[1]苯并吡喃并[3,4-c]吡唑(5a-h)和[1,9-b]二氢-1 -甲基-3a-硝基-4-苯基[1]苯并吡喃并[3,4-c]吡唑啉(6a-h)。讨论了这些环加成的区域和立体化学结果。测试了苯并吡喃并吡唑衍生物4a-h和6-ah对金黄色葡萄球菌,黄褐葡萄球菌,枯草芽孢杆菌,大肠杆菌,鼠伤寒沙门氏菌,酿酒酵母和白色念珠菌的抗微生物活性。化合物4a-h 被发现对测试的革兰氏阳性细菌和真菌具有中等活性。