HOLLEY, WILLIAM K.;RYSCHKEWITSCH, GEORGE E., PHOSPH., SULFUR AND SILICON AND RELAT. ELEM., 53,(1990) N-4, C. 271-284
作者:HOLLEY, WILLIAM K.、RYSCHKEWITSCH, GEORGE E.
DOI:——
日期:——
GNICHTEL, HORST;SINELL, MARTIN, LIEBIGS ANN. CHEM.,(1988) N 9, C. 919-921
作者:GNICHTEL, HORST、SINELL, MARTIN
DOI:——
日期:——
A regioselective synthesis of 5-pyrazolones and pyrazoles from phosphazenes derived from hydrazines and acetylenic esters
作者:Francisco Palacios、Ana M.Ochoa de Retana、Jaione Pagalday
DOI:10.1016/s0040-4020(99)00890-x
日期:1999.12
Efficient and regioselective syntheses of 1-phenyl-5-pyrazolones substituted with a phosphoranylidene group in the 3-position and of 3-alkoxycarbonyl-5-methoxy-1-phenyl pyrazoles are described. The key step is the formation of functionalized hydrazones by [2+2] cycloaddition reaction of phosphazenes derived from hydrazines with acetylenic esters. Subsequent cyclization of these compounds with butyl