A new method for synthesis of α,α-disubstituted carbonyl compounds from carbonyl compounds with one-carbon homologation through β-oxido carbenoid rearrangement as the key reaction
作者:Kohsuke Miyashita、Tsuyoshi Satoh
DOI:10.1016/j.tet.2005.03.054
日期:2005.5
with electrophiles such as aldehydes, ethyl chloroformate, benzoyl chloride, haloalkanes to give α,α-disubstituted carbonylcompounds in moderate to good yields. This method provides a new and efficient way for synthesis of α,α-disubstituted carbonylcompounds from carbonylcompounds with one-carbon homologation in only two synthetic operations.
A new synthesis of α,α-disubstituted carbonyl compounds from carbonyl compounds with one-carbon homologation
作者:Tsuyoshi Satoh、Kohsuke Miyashita
DOI:10.1016/j.tetlet.2004.04.154
日期:2004.6
with carbonyl compounds to afford adducts in high to quantitative yields. The adducts were treated with t-BuMgCl or LDA to give magnesium or lithium alkoxides, which were treated with i-PrMgCl or t-BuLi to afford the enolate with one-carbon elongation through β-oxido carbenoids. The enolate intermediates were found to be able to be trapped with electrophiles to give α,α-disubstituted carbonyl compounds