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.
Aminoboranes have been shown to be highly efficient and mild iminium ion generators in the Mannich-type aminative coupling of aldehydes with silyl ketene acetals. By using aminoboranes bearing bulky amino groups, such as a diisopropylamino group, free secondary amines can be successfully used as the amino component in a three-component Mannich reaction with aldehydes and silyl ketene acetals.
A New Look at Boron Enolate Chemistry: Aminative C−C Bond Formation Using Diaminoboron Enolate with Aldehyde
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 of 1,4-diketones by fluoride-catalysed Michael addition and supported permanganate oxidation
作者:James H. Clark、David G. Cork
DOI:10.1039/c39820000635
日期:——
A wide variety of 1,4-diketones may be prepared from simple starting materials by using fluoride ion-catalysed Michaeladditions and silica gel-supported permanganate-promoted Nef transformations.