Catalysis by zeolite leading to the construction of thiazole ring: an improved synthesis of 4-alkynyl substituted thiazoles
作者:K. Arunkumar、D. Naresh Kumar Reddy、K.B. Chandrasekhar、P. Rajender Kumar、K. Shiva Kumar、Manojit Pal
DOI:10.1016/j.tetlet.2012.05.062
日期:2012.7
facilitated the reaction of α-chloro acetyl chloride with 1,2-bis-trimethyl silyl acetylene to give 1-chloro-4-(trimethylsilyl)but-3-yn-2-one which on treatment with thioacetamide afforded 2-methyl-4-[(trimethylsilyl)ethynyl]thiazole. l-Proline on the other hand facilitated the coupling reaction of 2-methyl-4-[(trimethylsilyl)ethynyl]thiazole with (hetero)aryl halides (modified Sonogashira reaction) under Pd-Cu
H-β沸石促进α-氯代乙酰氯与1,2-双-三甲基甲硅烷基乙炔的反应,生成1-氯-4-(三甲基甲硅烷基)but-3-yn-2-one,经硫代乙酰胺处理后得到2 -甲基-4-[(三甲基甲硅烷基)乙炔基]噻唑。另一方面,1-脯氨酸在K 2 CO 3水溶液存在下,在Pd-Cu催化下促进了2-甲基-4-[(三甲基甲硅烷基)乙炔基]噻唑与(杂)芳基卤化物的偶联反应(改良的Sonogashira反应)。提供了一种用于合成相应的4-炔基取代的噻唑衍生物的改进方法。