作者:Alexander A. Tishkov、Alexey V. Lesiv、Yulya A. Khomutova、Yury A. Strelenko、Ivan D. Nesterov、Michael Yu. Antipin、Sema L. Ioffe、Scott E. Denmark
DOI:10.1021/jo034669a
日期:2003.11.1
3-alkyl-substituted 1,2-oxazine N-oxides 2 can be selectively transformed into 2-silyloxy-1,2-oxazines 1 upon treatment with silylating reagents. In the solid state derivatives 1 adopt a chair conformation with the pyramidal nitrogen atom, whereas in solution they exist as an equilibrating mixture of two conformers (DeltaG++ 55-60 kJ/mol). A preliminary study of the reactivity of nitrosals 1 has shown
用甲硅烷基化试剂处理后,可以将3-烷基取代的1,2-恶嗪N-氧化物2选择性地转化为2-甲硅烷氧基-1,2-恶嗪1。在固态衍生物1中,其构型与锥体氮原子呈椅构型,而在溶液中,它们呈两个构象体(DeltaG ++ 55-60 kJ / mol)的平衡混合物形式存在。对亚硝基化合物1的反应性的初步研究表明,它们与O和N稳定的碳阳离子反应,生成在3位带有官能化烷基取代基的1,2-恶嗪N-氧化物。此外,化合物1可以重排为甲硅烷氧基-1,2-恶嗪5,并与吗啉反应生成3-吗啉代烷基-1,2-恶嗪7,其与开链肟6以tautameric平衡存在。