β,β′-functionalized N,N-divinyl-N-trimethylsilyloxyamines via silylation of β-substituted aliphatic nitro compounds. The investigation of the mechanism of the process using selective trapping reagents
作者:Sema L. Ioffe、Il'ya M. Lyapkalo、Alexander A. Tishkov、Vitaliy M. Danilenko、Yuri A. Strelenko、Vladimir A. Tartakovsky
DOI:10.1016/s0040-4020(97)00831-4
日期:1997.9
good yields by silylation of nitro compounds XCH(R)CH2NO2 with N,O-bis(trimethylsilyl)acetamide. The mechanism of this reaction was studied by the example of silylation of methyl-3-nitropropionate using selective trapping reagents. Trimethylsilyl ester of the starting aci-nitro compound and methyl 2-nitroso acrylate were intercepted as consecutive intermediates. Thus, the silylation of β-functionalized
迄今未知的通式为[XC(R)= ch] 2 NOSiMe 3(X = CO 2 Me。CN。5-甲氧基羰基异恶唑啉-3-基的N,N-二乙烯基-N-三甲基甲硅烷基氧胺; R = H,Me,CH通过将硝基化合物XCH(R)CH 2 NO 2与N,O-双(三甲基甲硅烷基)乙酰胺甲硅烷基化,可以中等至良好的产率获得(Me)CO 2 Me)。通过使用选择性捕集剂对3-硝基丙酸甲酯进行甲硅烷基化的实例研究了该反应的机理。起始的三甲基甲硅烷酯ACI-硝基化合物和2-亚硝基丙烯酸甲酯被截取为连续的中间体。因此,可以将β-官能化的硝基化合物的甲硅烷基化作为通向实际上未知的β-取代的亚硝基烯烃XC(R)= CHNO的便利途径,其对于用作捕获剂的乙基乙烯基醚具有活性的1,3-杂二烯。
Studies on Organophosphorus Compounds; 70: A Novel Synthesis of Functionalized 4,5-Dihydroisoxazole Derivatives via α-Nitroalkenes
作者:Chaozhong Li、Chengye Yuan
DOI:10.1055/s-1993-25883
日期:——
Nucleophilic addition of nitroethylene with various carbanions followed by treatment with chlorotrimethylsilane gave the corresponding silyl nitronate as a 1,3-dipole, which reacted with a monosubstituted alkene (3-buten-2-one or methyl 2-propenoate) to give functionalized 4,5-dihydroisoxazole derivatives in a one-pot procedure.