Acylation of N-Boc-N-methylhydrazones followed by TFA treatment affords regioselective access to substituted pyrazoles. Both regioisomers of 1-methyl-3,5-disubstituted-1H-pyrazoles can be selectively obtained. This procedure can also be employed for the regioselective preparation of fully substituted 1H-pyrazoles.
Regioselective synthesis of 1,3,5- and 1,3,4,5-substituted pyrazoles via acylation of N-Boc-N-substituted hydrazones / A. Tinarelli; P. Righi; G. Rosini; D. Andreotti; R. Profeta; S. Spada. - In: TETRAHEDRON. - ISSN 0040-4020. - STAMPA. - 67:(2011), pp. 612-617. [10.1016/j.tet.2010.11.057]
Regioselective synthesis of 1,3,5- and 1,3,4,5-substituted pyrazoles via acylation of N-Boc-N-substituted hydrazones
TINARELLI, ALESSANDRO;RIGHI, PAOLO;ROSINI, GOFFREDO;
2011
Abstract
Acylation of N-Boc-N-methylhydrazones followed by TFA treatment affords regioselective access to substituted pyrazoles. Both regioisomers of 1-methyl-3,5-disubstituted-1H-pyrazoles can be selectively obtained. This procedure can also be employed for the regioselective preparation of fully substituted 1H-pyrazoles.File in questo prodotto:
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