A New Look at Boron Enolate Chemistry: Aminative C−C Bond Formation Using Diaminoboron Enolate with Aldehyde
摘要:
Unlike ordinary boron enolates, such as dialkylboryl (R2B) and dialkoxyboryl ((RO)(2)B) derivatives, reactions of diaminoboryl ((R2N)(2)B) enolates with aldehydes proceed with the concurrent transfer of amino and enoxy groups from the boron to the aldehyde carbon, yielding beta-amino ketones in a selective manner.
Synthesis and Structural Characterization of the Bis(diisopropylamino)boron Enolate of <i>tert</i>-Butyl Methyl Ketone
作者:Lili Ma、Russell Hopson、Deyu Li、Yong Zhang、Paul G. Williard
DOI:10.1021/om700676w
日期:2007.11.1
Lithium, sodium, and potassium enolates reacted with bisaminoboron halides to give bisaminoboron enolates 1a−5c. Specifically, the potassium enolate of tert-butyl methyl ketone reacted with bis(diisopropylamino)boron chloride in THF at room temperature within 1 h to give the bis(diisopropylamino)boron enolate of tert-butyl methyl ketone (3b) in 61−84% isolated yields. Under similar conditions, the
Unlike ordinary boron enolates, such as dialkylboryl (R2B) and dialkoxyboryl ((RO)(2)B) derivatives, reactions of diaminoboryl ((R2N)(2)B) enolates with aldehydes proceed with the concurrent transfer of amino and enoxy groups from the boron to the aldehyde carbon, yielding beta-amino ketones in a selective manner.