Synthesis of new 1-[4-methane(amino)sulfonylphenyl)]-5-[4-(aminophenyl)]-3-trifluoromethyl-1<i>H</i>-pyrazoles
作者:Khaled R. A. Abdellatif、Morshed A. Chowdhury、Edward E. Knaus
DOI:10.1002/jhet.5570450623
日期:2008.11
A regiospecific cyclization-dehydration reaction of a 1-[(4-(N-alkyl-N-(tert-butyloxycarbony)amino)-phenyl]-4,4,4-trifluorobutane-1,3-done with a 4-aminosulfonyl-, or 4-methylsulfonyl-, phenylhydrazine hydrochloride in refluxing ethanol proceeded with simultaneous loss of the N-tert-butyloxycarbonyl protecting group to afford a group of 1-(4-methanesulfonylphenyl or 4-aminosulfonylphenyl)-5-[4-(N-