The Preparation of 1H-Pyrazole-5-propanoic and 1H-Pyrazole-5-butanoic Acids from Dilithiated C(α),N-Carboalkoxyhydrazones and Succinic or Glutaric Acid Anhydrides
作者:A. Cameron Church、Madlene U. Koller、Sheila A. O'Grady、Charles F. Beam
DOI:10.1080/00397919608004575
日期:1996.7
Abstract C(α),N-Carboalkoxyhydrazones were dilithiated with excess lithium diisopropylamide, condensed with succinic or glutaric acid anhydride, and cyclized to 1H-pyrazole-5-propanoic or 1H-pyrazole-5-butanoic acids.
Huff, Ann M.; Beam, Charles F., Journal of Heterocyclic Chemistry, 1986, vol. 23, p. 1343 - 1346
作者:Huff, Ann M.、Beam, Charles F.
DOI:——
日期:——
Duncan, Dean C.; Trumbo, Todd A.; Almquist, Catharine D., Journal of Heterocyclic Chemistry, 1987, vol. 24, p. 555 - 560
作者:Duncan, Dean C.、Trumbo, Todd A.、Almquist, Catharine D.、Lentz, Teresa A.、Beam, Charles F.
DOI:——
日期:——
Preparation of 2<i>H</i>-spiro[benzo[<i>d</i>]isothiazole-3,3′-pyrazole]-1, 1-dioxide-2′(4′<i>H</i>)-carboxylates from dilithiated<i>C</i>(α),<i>N</i>-carboalkoxyhydrazones and methyl 2-(aminosulfonyl)benzoate
作者:Anna C. Dawsey、Chandra Potter、John D. Knight、Zachary C. Kennedy、Ellyn A. Smith、Amanda M. Acevedo-Jake、Andrew J. Puciaty、Clyde R. Metz、Charles F. Beam、William T. Pennington、Donald G. VanDerveer
DOI:10.1002/jhet.50
日期:2009.3
A variety of substituted spiro(benzoisothiazole-pyrazoles) have been prepared by the condensation of dilithiated C(α),N-carboalkoxyhydrazones with lithiated methyl 2-(aminosulfonyl)benzoate followed by the cyclization of intermediates with acetic anhydride, which also resulted in spiro N-acetylated products when carbomethoxyhydrazones or carboethoxyhydrazones were used, and spiro NH products when