Cu(I)-Catalyzed Regioselective Synthesis of Pyrazolo[5,1-c]-1,2,4-triazoles
摘要:
Cycloadditions of terminal alkynes to 1,2,4-triazolium N-imides in the presence of base and Cu(I) afford pyrazolo[5,1-c]-1,2,4-triazoles regioselectively. The scope of alkynes, the influence of the electronic nature of the leaving group, and variations in the 1-alkyl substituent were examined. Quantum chemical calculations were employed to explain the distinct reactivity of the propiolates.
Cu(I)-Catalyzed Regioselective Synthesis of Pyrazolo[5,1-<i>c</i>]-1,2,4-triazoles
作者:Davit Jishkariani、C. Dennis Hall、Alexander A. Oliferenko、David Leino、Alan R. Katritzky
DOI:10.1021/jo300611a
日期:2012.7.6
Cycloadditions of terminal alkynes to 1,2,4-triazolium N-imides in the presence of base and Cu(I) afford pyrazolo[5,1-c]-1,2,4-triazoles regioselectively. The scope of alkynes, the influence of the electronic nature of the leaving group, and variations in the 1-alkyl substituent were examined. Quantum chemical calculations were employed to explain the distinct reactivity of the propiolates.