Synthesis and Application of Triazole Derivatives. Synthesis of 3- and 5-Acyl-1,2,4-triazoles via Lithiation of 1-Alkyl-1H-1,2,4-triazoles.
作者:Shunsaku OHTA、Ikuo KAWASAKI、Akihisa FUKUNO、Masayuki YAMASHITA、Toshiji TADA、Tetsuo KAWABATA
DOI:10.1248/cpb.41.1226
日期:——
N-Unsubstituted 3-acyl-1H-1, 2, 4-triazoles (3), and 5-acyl-1-alkyl-1H-1, 2, 4-triazoles (4) were synthesized by acylation of 5-lithiotriazoles with amides. The 3-position of 1-methyl-5-phenylthio-1H-1, 2, 4-triazole (11) was lithiated by lithium 2, 2, 6, 6-tetramethylpiperidide, and acylation of the produced carbanion with amides followed by desulfurization with Raney nickel give the 3-acyl derivatives (5). The structural isomers, 3-acyl-4-alkyl-4H-1, 2, 4-triazoles (6), were prepared by N-methylation of 3.
N-未取代的3-酰基-1H-1, 2, 4-三唑 (3) 和5-酰基-1-烷基-1H-1, 2, 4-三唑 (4) 通过5-锂三唑与酰胺的酰基化反应合成。1-甲基-5-苯硫基-1H-1, 2, 4-三唑 (11) 的3位通过锂化剂锂-2, 2, 6, 6-四甲基哌啶对其进行锂化,随后用酰胺对生成的负离子进行酰基化,并用Raney镍进行脱硫反应得到3-酰基衍生物 (5)。结构异构体3-酰基-4-烷基-4H-1, 2, 4-三唑 (6) 是通过对3进行N-甲基化反应制备的。