Heterocyclic nitronate anions prepared from 3-ethyl-5-hydroxymethyl-5-nitrotetra-hydro-1,3-oxazine are found to be suitable nucleophiles for SRN1 reactions. Base-promoted nitrous acid elimination from C-alkylation product gives rise to new tetrahydro-1,3 oxazines with a trisubstituted ethylenic double bond in the 5 position.
发现由3-乙基-
5-羟甲基-5-硝基四氢-1,3-恶嗪制备的杂环
亚硝酸根阴离子是适合于S RN 1反应的亲核试剂。从C-烷基化产物中除去碱促进的
亚硝酸,生成新的四氢-1,3-恶嗪,其在5位具有三取代的烯键式双键。