Synthesis and reactions of chloroazodienes. A new and general synthesis of pyridazines
作者:Michael S. South、Terri L. Jakuboski
DOI:10.1016/0040-4039(95)01128-5
日期:1995.8
base gives 4-chloroazodienes, which were found to combine with a variety of electron rich olefins to yield chloro-substituted tetrahydropyridazines. These chloroazodiene cyclizations are best characterized as inverse electron demand, 4+2 hetero Diels-Alder reactions that maintain a high degree of regio- and stereochemical control. The chloro-substituted tetrahydropyridazines that are formed give high yields
Synthesis and Reactions of Haloazodienes. A New and General Synthesis of Substituted Pyridazines
作者:Michael S. South、Terri L. Jakuboski、Mark D. Westmeyer、Daniel R. Dukesherer
DOI:10.1021/jo960029e
日期:1996.1.1
tetrahydropyridazines that are formed give high yields of substituted pyridazines upon treatment with base (Table 1). The sequence of a chloroazodiene cyclization to a tetrahydropyridazine followed by an aromatization constitutes a new and generalsynthesis of substituted pyridazines. In contrast to the haloazodiene cyclizations, the novel cyclization reactions of the in-situ generated 1-carbethoxy-3-phenyl-4
Metallo-Aldehyde Enolates via Enal Hydrogenation: Catalytic Cross Aldolization with Glyoxal Partners As Applied to the Synthesis of 3,5-Disubstituted Pyridazines
作者:Gwendolyn A. Marriner、Susan A. Garner、Hye-Young Jang、Michael J. Krische
DOI:10.1021/jo030310a
日期:2004.2.1
Aldehyde enolates generated through rhodium-catalyzed enal hydrogenation are subject to electrophilic trapping by exogenous glyoxal partners to afford beta-hydroxy-gamma-keto-aldehyde products, which upon exposure to hydrazine afford 3,5-disubstituted pyridazines in moderate yield in a two-step, one-pot sequence.
Samaritoni, Jack G.; Babbitt, George, Journal of Heterocyclic Chemistry, 1991, vol. 28, # 3, p. 583 - 587