Acid-catalyzed N-alkylation of tosylhydrazones using benzylic alcohols
摘要:
N-Alkylation of tosylhydrazones in the presence of an acid catalyst is described for the first time. Tris(pentafluorophenyl) borane was found to be a mild and efficient catalyst when benzylic alcohols were used as the alkylating agents. (C) 2009 Elsevier Ltd. All rights reserved.
Selective synthesis of 4-(sulfonyl)-methyl-1H-pyrazoles and (E)-4,5-dihydro-1H-pyrazoles fromN-allenic sulfonylhydrazones with sulfonyl group migrations has been developed.