Transformation of pyrazolo[4,3-<i>c</i>]isothiazoles into 3,4-disubstituted 1,2-isothiazoles
作者:Taisei Ueda、Yoshitsugu Shibata、Jinsaku Sakakibara
DOI:10.1002/jhet.5570230634
日期:1986.11
Pyrazolo[4,3-c]isothiazoles 4 and 5 were synthesized by the reaction of 4-aminoantipyrine 1 with thionyl chloride. Treatment of 4 or 5 with alkylamines underwent pyrazole ring opening to afford 3,4-disubstituted 1,2-isothiazoles 8a-f.
通过4-氨基安替比林1与亚硫酰氯的反应合成了吡唑并[4,3-c]异噻唑4和5。用烷基胺处理4或5进行吡唑开环,得到3,4-二取代的1,2-异噻唑8a-f。