A new procedure for the synthesis of 4<i>H</i>-pyrazolo[1,5-<i>c</i>][1,3,5]thiadiazine-4-thiones
作者:C. B. Vicentini、A. C. Veronese、M. Guarneri、M. Manfrini、P. Giori、S. Guccione
DOI:10.1002/jhet.5570310632
日期:1994.11
amides 2 with the Lawesson reagent afforded the corresponding thiocarboxamides 3. Heating of 3 in formic acid gave the N-dealkylated thiocarboxamides 4 which were cyclized into 4H-pyrazolo[1,5-c][1,3,5]thiadiazine-4-thiones 5 by treatment with thiophosgene.
用Lawesson试剂对N-(1-叔丁基-3-甲基吡唑-5-基)羧酰胺2进行噻吩反应,得到相应的硫代羧酰胺3。在甲酸中加热3得到N-去烷基化的硫代羧酰胺4,其通过用硫光气处理而环化成4 H-吡唑并[1,5- c ] [1,3,5]噻二嗪-4-硫酮5。