A Safe Synthesis of 1,5-Disubstituted 3-Amino-1H-1,2,4-triazoles from 1,3,4-Oxadiazolium Hexafluorophosphates
作者:Haiming Zhang、Brian Wong、Andreas Stumpf、Diane Carrera、Chunang Gu
DOI:10.1055/s-0032-1316877
日期:——
displays a broad scope with respect to N-substitutions and N′-acyl protecting groups. Hexafluorophosphoric acid promotes 1,3,4-oxadiazolium hexafluorophosphate formation from N′-acyl-N-aroyl-N-arylhydrazides or N′-acyl-N-acyl-N-arylhydrazides under mild conditions. These 1,3,4-oxadiazolium hexafluorophosphates can be treated with cyanamide in propan-2-ol in the presence of triethylamine to generate 1,5-disubstituted
摘要 六氟磷酸促进了从1,3,4-六氟磷酸oxadiazolium形成Ñ '-acyl- Ñ -aroyl- Ñ -arylhydrazides或ñ '-acyl- Ñ -acyl- Ñ温和的条件下-arylhydrazides。这些1,3,4-恶二唑六氟磷酸盐可以在三乙胺存在下在丙-2-醇中用氰酰胺处理,以高收率产生1,5-二取代的3-氨基-1 H -1,2,4-三唑。该安全且可扩展的协议在N取代和N'-酰基保护基方面显示出广泛的范围。 六氟磷酸促进了从1,3,4-六氟磷酸oxadiazolium形成Ñ '-acyl- Ñ -aroyl- Ñ -arylhydrazides或ñ '-acyl- Ñ -acyl- Ñ温和的条件下-arylhydrazides。这些1,3,4-恶二唑六氟磷酸盐可以在三乙胺存在下在丙-2-醇中用氰酰胺处理,以高收率产生1,5-二取代的3-氨基-1 H -1,2