Masked β-, γ- and δ-lithium ester enolates: useful reagents in organic synthesis
作者:Isidro M Pastor、Miguel Yus
DOI:10.1016/s0040-4039(00)02172-9
日期:2001.2
acid-catalysed methanolysis, to functionalised methyl esters 2. In the case of chlorotrimethylsilane, hydroxyethyl esters 2′ are isolated. The reaction is also applied to bicyclic orthoesters 3: whereas β-chloro derivatives and carbonyl compounds gives directly γ-lactones 4 after hydrolysis, the corresponding γ-chloro derivative affords the expected methyl esters after methanolysis.
Treatment of non-activated alkylhalides 1 with aldehydes 3 in the presence of zinc metal and chlorotrimethylsilane (TMSCI), DMA and/or NMP in THF brought about highly facile and effective cross-coupling to give the corresponding alcohols in good yield. These reactions are assumed to proceed through zinc reagent intermediates generated in situ.