Efficient Synthesis of 5,5-Dialkyl-Δ<sup>1</sup>-1,2,4-triazolin-3-ones by Acid Hydrolysis of Bis(α-isocyanatoalkyl)diazenes
作者:Joachim G. Schantl、Hubert Gstach、Norbert Lanznaster
DOI:10.1055/s-1987-28143
日期:——
The hydrolysis of bis(α-isocyanatoalkyl)diazenes with hydrochloric acid affords the novel 5,5-dialkyl-Î1-1,2,4-triazolin-3-ones in good yields, and is a minor by-product, the corresponding 4-aminocarbonyl derivatives. The 1,2,4-triazolin-3-ones are easily converted into the 4-benzoyl derivatives which, in turn, react as mild benzoylating agents toward primary amines.
双(α-
异氰酸酯烷基)
二氮烯与
盐酸的
水解反应产生新颖的5,5-二烷基-Δ1-
1,2,4-三氮唑-3-
酮,产率良好,而相应的4-
氨基
酮衍
生物则是少量副产物。这些
1,2,4-三氮唑-3-
酮容易转化为4-
苯甲酰衍
生物,而后者则可以作为温和的
苯甲酰化试剂与初级胺发生反应。