Gas-phase pyrolysis of 4-amino-3-allylthio-1,2,4-triazoles: a new route to [1,3]thiazolo[3,2-b][1,2,4]triazoles
作者:Dale D. J. Cartwright、Bernard A. J. Clark、Hamish McNab
DOI:10.1039/b007638o
日期:——
Flash vacuum pyrolysis of the 3-allylthio derivatives of 4-amino-4H-1,2,4-triazoles 10–13 and 15–17 at 750–850 °C (10−2–10−3 Torr) gives [1,3]thiazolo[3,2-b][1,2,4]triazoles 19 and 24–29 in ca. 50% yield. The mechanism is thought to involve initial [3,3]sigmatropic shift of the allyl group, followed by cleavage of the N–N bond to generate a thiaza-allyl radical, which then undergoes cyclisation, rearrangement
闪蒸真空热解在750-850°C(10 -2 -10 -3 Torr)下,4-氨基-4 H -1,2,4-三唑10-13和15-17的3-烯丙硫基衍生物的定量结果为[1,3]噻唑并[3,2- b ] [1,2,4]三唑19和24-29在约 收率50%。该机制被认为涉及初始的[3,3]σ向位移。烯丙基然后裂解N–N键生成噻唑-烯丙基自由基,然后进行 环化,重排和烷基 挤压。