已经开发了通过使用H 2 O-THF中的NaOH亲核取代3-芳基-4-硝基呋喃烷中的硝基来制备待探索的3-芳基-4-羟基呋喃烷的通用而简单的方法。用各种甲基化试剂(CH 2 N 2,MeI,(MeO)2 SO 2)研究了3-芳基-4-羟基呋喃恶烷的甲基化,这首次表明3-芳基-4-羟基呋喃恶烷倾向于侧-链质变互变异构。在温和条件下,合成了新型呋喃喃衍生物,N(5)-烷基化产物(3-芳基-5-甲基-1,2,5-恶二唑-4(2 H)-一2-氧化物)。与O的区域选择性形成-烷基化产物(3-芳基-4-甲氧基呋喃烷)。
Nitrosation of salts of 1-hydroxyimino-2,2-dinitro-1-R-ethanes, a novel method for the preparation of isomeric 3(4)-nitro-4(3)-R-furoxans
作者:I. V. Ovchinnikov、A. O. Finogenov、M. A. Epishina、A. S. Kulikov、Yu. A. Strelenko、N. N. Makhova
DOI:10.1007/s11172-009-0292-z
日期:2009.10
A novel general method for the synthesis of isomeric 3(4)-nitro-4(3)-R-furoxans is developed. 3-Nitro isomers were obtained by reaction of hydroximoylchlorides with dinitromethane sodium salt followed by conversion of the resulting 1-substituted 1-hydroxyimino-2,2-dinitroethanes into dipotassium (or disodium salts) and their subsequent nitrosation with NaNO2 in AcOH or with N2O4. Thermal isomerization