Diethyl Phosphite Initiated Coupling of α-Ketoesters with Imines for Synthesis of α-Phosphonyloxy-β-amino Acid Derivatives and Aziridine-2-carboxylates
作者:Jin Jiang、Hui Liu、Chong-Dao Lu、Yan-Jun Xu
DOI:10.1021/acs.orglett.6b00273
日期:2016.2.19
Coupling of α-ketoesters with imines initiated by diethylphosphite in the presence of alkaline metal hexamethyldisilazides is reported. Base-promoted addition of diethylphosphite to α-ketoesters, followed by [1,2]-phosphonate/phosphate rearrangement, generates α-phosphonyloxy enolates that are subsequently intercepted by imines. The use of suitable azomethine coupling partners allows selective construction
Asymmetric organocatalytic decarboxylative Mannich reaction using β-keto acids: A new protocol for the synthesis of chiral β-amino ketones
作者:Chunhui Jiang、Fangrui Zhong、Yixin Lu
DOI:10.3762/bjoc.8.144
日期:——
The first decarboxylativeMannichreaction employing beta-keto acids, catalyzed by cinchonine-derived bifunctional thiourea catalyst has been described. The desired beta-amino ketones were obtained in excellent yields and with moderate to good enantioselectivities.