Novel synthetic route to aryl alkanes from aromatic aldehydes and ketones. Novel geminal dialkylation of the carbonyl group of aromatic aldehydes and ketones
作者:Alain Krief、M. Clarembeau、Ph. Barbeaux
DOI:10.1039/c39860000457
日期:——
Benzyl-lithiums, readily available from benzyl methyl selenides and alkyl-lithiums, are efficiently alkylated; this reaction allows the geminaldialkylation of the carbonylgroups of aromaticaldehydes and ketones and the geminal aryl–alkylation of aliphatic analogues.
A novel method for the geminal dialkylation of the carbonyl group of aromatic aldehydes and ketones
作者:M. Clarembeau、A. Krief
DOI:10.1016/s0040-4039(00)84356-7
日期:1986.1
The title transformation is efficiently achieved by using the selenium methodology which involves the sequential reductive alkylation of arylselenoacetals and of benzylselenides.
The reductive cleavage of aromatic dimethylacetals and ketals, 1, with Li metal in THF at low temperature allows the generation of stable α-alkoxy-α-arylsubstituted carbanions, avoiding the Wittig rearrangement. Reaction of these carbanions with various electrophiles afforded the expected products 2. Further in situ reaction of compounds 2 afforded the products of reductive electrophilic disubstitution