Heterocyclizations via POCl3-Based Multicomponent Reactions: A New Approach to One-Pot Synthesis of a New Spirosystem, 7-Methyl-5-[4-(aryl/heteryl)thiazol-2-yl]-5,6-diazaspiro[2,4]hept-6-en-4-ones
摘要:
A novel multicomponent reaction involving phenacylbromide, thiosemicarbazide, and -acetyl--butyrolactone in the presence of POCl3, forming 7-methyl-5-[4-(aryl/heteryl)thiazole-2-yl]-5,8-diaza spiro[2,4]hept-6-en-4-ones in good yields, is described.
使用可重复使用的非均相催化剂合成5-芳基-(N-苯基-)6 H -1,3,4-噻二嗪-2-铵盐的温和高效方法
摘要:
从以下反应可有效地合成5-芳基-6 H -1,3,4-噻二嗪-2-铵和5-芳基-N-苯基-6 H -1,3,4-噻二嗪-2-铵盐使用i)二氧化硅负载的硫酸氢钠和ii)二氧化硅硫酸作为可重复使用的非均相催化剂,在室温下在乙腈中制备thiosemicarbazide和α-卤代酮。实验过程很简单,并且以高收率获得了产物。