Reductive allylation of 1H-pyridine-2-(thio)ones by means of the novel lithium allyldibutylmagnesate reagent
作者:Jacek G. Sośnicki
DOI:10.1016/j.tetlet.2005.04.097
日期:2005.6
A new highly efficient allylation reagent-lithium allyidibutylinagnesate (allylBu(2)MgLi)-was obtained by mixing allyl-magnesium chloride (1 equiv) and n-BuLi (2 equiv). N-Lithiated and N-methyl substituted 1H-pyridine-2-thiones and -ones were successfully and regioselectively allylated by treatment with ally[Bu2MgLi] yielding 6-allyl-3,6-dihydro-1H-pyridine-2-(thio)ones and 4-allyl-3,4-di-hydro-1H-pyridine-2-(thio)ones. The latter were formed by a 3,3-sigmatropic Cope rearrangement of the former. (c) 2005 Elsevier Ltd. All rights reserved.