A carbamoyl-substituted nitrileoxide was generated upon treatment of easily available 2-methyl-4-nitro-3-isoxazolin-5(2H)-one with THF (not dried); the reaction proceeded efficiently even in the absence of any special reagents and reaction conditions. The nitrileoxide caused 1,3-dipolarcycloaddition with common aliphatic nitriles or electron-rich aromatic nitriles to afford 3-functionalized 1,2
The formation of furoxan-3,4-dicarboxamides from nitroacetamides
作者:Philip A. Harris、Arthur Jackson、John A. Joule
DOI:10.1016/s0040-4039(00)99199-8
日期:——
Secondary and tertiary nitroacetamides are converted by treatment with thionyl chloride alone into furoxan-3,4-dicarboxamides.
通过单独用亚硫酰氯处理,将仲和叔硝基乙酰胺转化为呋喃喃-3,4-二甲酰胺。
Conjugate Addition versus Cycloaddition/Condensation of Nitro Compounds in Water: Selectivity, Acid-Base Catalysis, and Induction Period
作者:Luca Guideri、Francesco De Sarlo、Fabrizio Machetti
DOI:10.1002/chem.201202698
日期:2013.1.7
react in water as in chloroform with electron‐deficient dipolarophiles to give condensation or conjugate addition products under basecatalysis. In general, high selectivity towards condensation is observed in water, with shorter induction periods than in chloroform. In water, condensations slowly occur even without base; kinetic profiles evidence the catalytic effect of the base, which should be related
A nitrile oxide containing a carbamoyl group is readily generated upon the treatment of 2-methyl-4-nitro-3-isoxazolin-5(2H)-one with water under mild reaction conditions, even in the absence of special reagents. The obtained nitrile oxide undergoes cycloaddition with dipolarophiles, alkynes and alkenes, to afford the corresponding isoxazol(in)es, which are useful intermediates in the synthesis of polyfunctionalized