Asymmetric α-amination of β-keto esters using a guanidine–bisurea bifunctional organocatalyst
作者:Minami Odagi、Yoshiharu Yamamoto、Kazuo Nagasawa
DOI:10.3762/bjoc.12.22
日期:——
An asymmetric α-amination of β-keto esters with azodicarboxylate in the presence of a guanidine–bisurea bifunctional organocatalyst was investigated. The α-amination products were obtained in up to 99% yield with up to 94% ee.
The Cu(OTf)2-bipyridine-catalyzed, enantioselective, direct α-amination of β-ketoesters and β-diketones with diethyl azodicarboxylate (DEAD) has been studied. Exceptionally high enantioselectivities of up to 99% ee were found for 1-indanone-based β-ketoesters in particular even for substrates and reagents carrying conventional ester groups such as methyl and ethyl.