Reactions of trimethylsilylthiazoles with ketens: a new route to regioselective functionalisation of the thiazole ring
作者:Alessandro Medici、Paola Pedrini、Alessandro Dondoni
DOI:10.1039/c39810000655
日期:——
2-Trimethylsilythiazole (2) and 2,5-bis(tri-methylsilyl) thiazole (6) undergo ipso-substitution of the 2-SiMe3 group with various ketens affording the thiazolyl-trimethylsiloxy-ethylenes (3) and(7), respectively, which are hydrolysed to the 2-acylthiazoles (4), whereas 5-trimethylsilylthiazole (8) undergoes attack at C-2 by dichloroketen giving the Michael-type adduct 2-dichloro-acetyl-5-trimethylsilylthiazole
2-三甲基甲硅烷基噻唑(2)和2,5-双(三甲基甲硅烷基)噻唑(6)进行2-SiMe 3基团的ipso取代,得到各种酮,得到噻唑基-三甲基甲硅烷氧基-乙烯(3)和(7),分别被水解成2-酰基噻唑(4),而5-三甲基甲硅烷基噻唑(8)在C-2上受到二氯酮的攻击,得到迈克尔型加合物2-二氯-乙酰基-5-三甲基甲硅烷基噻唑(9c)。