Acetic acid and propanoic acid were treated with thionyl chloride to give respective acid chlorides, which were then reacted with synthesized pyrazolines using triethylamine as catalyst in dry dichloromethane to give N-acetylated pyrazolines (1b-7b) and N-propanoylated pyrazolines (1c-7c). Synthesized N-substituted pyrazolines were characterized by IR, 1H NMR and 13C NMR spectral studies. Prepared compounds were screened for their microbial activity against Bacillus sp., Pseudomonas sp., Acinetobactor sp. and Klebsiella sp. N-acetylated (7b) and N-propanoylated (7c) pyrazolines having substitution of methoxy group at meta position and hydroxy group at para position of benzene ring were found effective against Bacillus sp., Acinetobactor sp. and Pseudomonas sp. but not against Klebsiella sp. All pyrazolines and N-substituted pyrazolines exhibited less activity than standard ampicillin at all the tested concentrations.
醋酸和
丙酸经过
氯化亚
硫酰处理生成各自的酸
氯,再与合成的
吡唑啉在无
水二氯甲烷中使用
三乙胺作为催化剂反应,生成N-乙酰化
吡唑啉(1b-7b)和N-丙酰化
吡唑啉(1c-7c)。合成的N-取代
吡唑啉通过红外光谱(IR)、1H核磁共振(NMR)和13C核磁共振(NMR)进行表征。所制备的化合物对芽孢杆菌(Bacillus sp.)、
铜绿假单胞菌(Pseudomonas sp.)、嗜盐菌(Acinetobacter sp.)和克雷伯氏菌(Klebsiella sp.)的微
生物活性进行了筛选。具有甲氧基在间位和羟基在对位的N-乙酰化(7b)和N-丙酰化(7c)
吡唑啉显示出对芽孢杆菌、嗜盐菌及
铜绿假单胞菌的有效活性,但对克雷伯氏菌无效。所有
吡唑啉和N-取代
吡唑啉在所有测试浓度下的活性均低于标准
青霉素(
氨苄
青霉素)。