Verdazyl Radicals as Substrates for Organic Synthesis: Unique Access to Tetrahydropyrazolotriazinones, Pyrazolotriazinones and Dihydrotetrazinylacrylonitriles
作者:Eric K. Y. Chen、Matthew Bancerz、Gordon K. Hamer、Michael K. Georges
DOI:10.1002/ejoc.201000789
日期:2010.10
6-oxoverdazyl radical was recently shown to undergo a disproportionation reaction to form an azomethine imine, which reacted with a series of dipolarophiles, to form novel tetrahydropyrazolotetrazinone heterocyclic structures, demonstrating for the first time the use of verdazyl radicals as substrates for organic synthesis. Herein, we report on the chemistry of this verdazyl radical with captodative
1,5-Dimethyl-3-phenyl-6-oxoverdazyl 自由基最近被证明会发生歧化反应形成偶氮甲亚胺,该亚胺与一系列的偶极体反应,形成新的四氢吡唑并四嗪酮杂环结构,首次证明了其用途verdazyl 自由基作为有机合成的底物。在此,我们报告了这种 verdazyl 自由基与封端烯烃的化学反应,并表明发生的反应,无论是加成反应还是夺氢反应,然后是环加成反应,都是由封端烯烃定义的。还强调的是最初形成的四氢吡唑并四嗪酮环加合物的分子内重排为吡唑并三嗪酮或四氢吡唑并三嗪酮结构。