The Lewis acid-catalyzed reaction of nitro olefins and ketene methyl trimethylsilyl acetals afforded methyl 4-oxo-carboxylates on hydrolysis of the resulting adducts followed by treatment with diazomethane.
Synthesis of unsaturated silyl nitronates via the silylation of conjugated nitroalkenes
作者:Elizaveta A. Khotyantseva、Andrey A. Tabolin、Roman A. Novikov、Yulia V. Nelyubina、Sema L. Ioffe
DOI:10.1016/j.tetlet.2018.07.011
日期:2018.8
A new method for the synthesis of conjugated silyl nitronates from nitroalkenes is described. The procedure has wide substrate scope and is compatible with in situ generation of the substrates from 2-nitroalcohols or 2-chloro-nitroalkanes. A cascade transformation to give 3,4,5,6-tetrahydropyridine N-oxide derivatives was disclosed.
The Michael reaction of silyl enol ethers or ketene silyl acetals with conjugated nitro olefins activated by Lewis acids: new synthesis of 1,4-diketones and .gamma.-oxo esters