GdCl3 catalysed Grieco condensation: A facile approach for the synthesis of novel pyrimidine and annulated pyrimidine fused indazole derivatives in single pot under mild conditions and their anti-microbial activity
作者:T. Yakaiah、B.P.V. Lingaiah、B. Narsaiah、K. Pranay Kumar、U.S.N. Murthy
DOI:10.1016/j.ejmech.2007.03.031
日期:2008.2
2 were independently reacted with formaldehyde followed by unsymmetrical, symmetrical and cyclic electron rich olefins in presence of GdCl(3) as catalyst and obtained pyrimidine fused indazole derivatives 3 and 4, respectively. The reaction is found to be concerted and an exclusive product is formed. Representative examples of compounds 3 and 4 were screened against Gram-positive, Gram-negative bacteria
吲唑区域异构体为3-氨基-4-(三氟甲基)-6-苯基-1H-吲唑-7-腈1和3-氨基-6-(三氟甲基)-4-苯基-1H-吲唑-7-腈2在GdCl(3)作为催化剂存在下,与甲醛独立反应,然后与不对称,对称和环状富电子烯烃反应,分别获得嘧啶稠合的吲唑衍生物3和4。发现该反应是一致的,并且形成了排他的产物。在体外针对革兰氏阳性,革兰氏阴性细菌和真菌物种(例如酵母和丝状真菌)筛选了化合物3和4的代表性实例。化合物3f对所有革兰氏阳性和革兰氏阴性细菌均表现出显着的活性,而化合物3h和4a相对于青霉素和链霉素显示的活性最低。