A Convenient Procedure for the Synthesis of 3-Substituted 5,6-Dihydro-4<i>H</i>-1,2-oxazines from Nitroethane
作者:Alexey Lesiv、Sema Ioffe、Alexey Sukhorukov、Michael Klenov、Pavel Ivashkin、Yulya Khomutova
DOI:10.1055/s-2006-958930
日期:2007.1
A novel and efficient four-step procedure for the synthesis of C-3-functionalised 5,6-dihydro-4H-1,2-oxazines from nitroethane is described. It includes preparation of 3-methyl-substituted six-membered cyclic nitronates, 3-(bromomethyl)-substituted 5,6-dihydro-4H-1,2-oxazines as intermediates, and nucleophilic substitution of bromine. Total yields of the target C-3-functionalised oxazines are 15-30%
描述了一种从硝基乙烷合成 C-3-官能化 5,6-二氢-4H-1,2-恶嗪的新型高效四步法。包括制备3-甲基取代的六元环状硝酸酯、3-(溴甲基)-取代的5,6-二氢-4H-1,2-恶嗪中间体、溴的亲核取代。来自硝基乙烷的目标 C-3-官能化恶嗪的总产率为 15-30%。