A number of 3-bromo-5,6-dihydro-4H-1,2-oxazine N-oxides have been synthesized and subjected to [3+2] cycloaddition with alkenes affording various types of products: 3-vinyloxazolines, isoxazoline N-oxides, and 3-functionalized 1,2-oxazine N-oxides. 1,2-oxazine N-oxide - isoxazoline - cycloaddition - nitronates - nitroso acetals
已经合成了许多3-溴-5,6-二氢-4 H -1,2-恶嗪N-氧化物,并与烯烃进行[3 + 2]环加成反应,从而提供各种类型的产物:3-乙烯基恶唑啉,异恶唑啉N -氧化物和3-官能化的1,2-恶嗪N-氧化物。 1,2-恶嗪N-氧化物-异恶唑啉-环加成-硝酸盐-亚硝基缩醛
Reactions of bromonitroalkenes with tervalent phosphorus. Part I. Reaction in aprotic solvents
作者:Celestine J. Devlin、Brian J. Walker
DOI:10.1039/p19730001428
日期:——
The reaction of a variety of 2-substituted 1-bromo-1-nitroethylenes with triphenylphosphine in benzene or ethyl acetate gave good yields of cyanomethyl(triphenyl)phosphonium salts, which on treatment with base afforded the corresponding ylides. An analogous cyanomethylphosphonate was obtained from a reaction with triethyl phosphite. Three alternative sites of initial attack by phosphine are considered