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.
Tandem conjugate addition-aldol reaction to α,β-unsaturated esters and ketones using titanium amide
作者:Akira Hosomi、Toshiharu Yanagi、Makoto Hojo
DOI:10.1016/s0040-4039(00)79926-6
日期:1991.5
Titanium dialkylamide, readily available, adds to a α,β-unsaturated esters and ketones in a conjugateaddition mode to give ester and ketone enolates, respectively, which are successively quenched with electrophiles such as aldehydes and acetals. The aldol products can be readily converted to the corresponding deaminated or dehydrated derivatives selectively.