Nitrile Oxide [3 + 2] Cycloaddition: Application to the Synthesis of 6-Substituted 3(2H)-Pyridazinones and 6-Substituted 4,5-Dihydro-4-hydroxy-3(2H)-pyridazinones
Intramolecular photochemical [2 + 1]-cycloadditions of nucleophilic siloxy carbenes
作者:Amanda Bunyamin、Carol Hua、Anastasios Polyzos、Daniel L. Priebbenow
DOI:10.1039/d2sc00203e
日期:——
singlet nucleophiliccarbenes undergo rapid [2 + 1]-cycloaddition with tethered olefins to afford unique bicyclo[3.1.0]hexane and bicyclo[4.1.0]heptane scaffolds. This cyclopropanation process requires only visible light irradiation to proceed, circumventing the use of exogenous (photo)catalysts, sensitisers or additives and showcases a vastly underexplored mode of reactivity for nucleophilic carbenes
Unexpected behaviour of the oxidizing agent sodium<i>m</i>-nitrobenzenesulfonate: Synthesis of a new class of 5-hydroxy benzopyrano-[4,3-<i>c</i>]pyridazin-3(2<i>H</i>)-ones
作者:Giorgio Cignarella、Daniela Barlocco
DOI:10.1002/jhet.5570320114
日期:1995.1
m-nitrobenzene sulfonate, widely used in dehydrogenation of 4,5-dihydro-3(2H)-pyridazinones to their corresponding aromatic derivatives, behaves in an unexpected way when 4,4a-dihydro-5H[1]benzopyrano[4,3-c]pyridazin-3(2H)-ones are employed as substrate. The synthesis of a newclass of 5-hydroxy[1]benzopyrano[4,3-c]pyridazin-3(2H)-ones is described.
钠米-硝基苯磺酸酯,广泛用于4,5-二氢-3-(2-脱氢ħ) -哒嗪酮为它们相应的芳族衍生物,以意想不到的方式的行为时-4,4a-二氢5 ħ [1]苯并吡喃并[4 ,3 - c ]哒嗪-3(2 H)-1被用作底物。描述了新型的5-羟基[1]苯并吡喃并[4,3 - c ]哒嗪-3(2 H)-ones的合成。