The preparation of N-(1<i>H</i>-pyrazol-3-yl)arylamides and 1<i>H</i>-pyrazol-3-amines from polylithiated C(α),<i>N</i>-thiosemicarbazones and C(α),<i>N</i>-semicarbazones
作者:Charles F. Beam、Sharon E. Davis、Tracy L. Cordray、Kam W. Chan、Camille M. Kassis、Joanna G. Freeman Davis、G. Mark Latham、Tina S. Guion、Karen C. Hildebran、A. Cameron Church、Madlene U. Koller、Clyde R. Metz、William T. Pennington、Kevin L. Schey
DOI:10.1002/jhet.5570340527
日期:1997.9
C(α),N-Thiosemicarbazones or C(α),N-semicarbazones were polylithiated with excess lithium diiso-propylamide, and the resulting cyclized intermediates were condensed with aromatic esters to afford N-(1H-pyrazol-3-yl)arylamides. The polylithiated intermediates were also quenched with aqueous acid to give 5-substituted, 1H-pyrazol-3-amines.
Ç(α),Ñ -Thiosemicarbazones或Ç(α),Ñ -semicarbazones用过量的二异锂丙酰胺polylithiated,并将得到的环化的中间体用芳香酯缩合,得到ñ - (1 ħ吡唑-3-基)芳基酰胺。还用酸水溶液淬灭多聚的中间体,得到5-取代的1H-吡唑-3-胺。