Stereoselective cyanation of chiral α-amino aldehydes by reaction with Nagata's reagent: a route to enantiopure β-amino-α-hydroxy acids
作者:José M. Andrés、Marı́a A. Martı́nez、Rafael Pedrosa、Alfonso Pérez-Encabo
DOI:10.1016/s0957-4166(01)00044-1
日期:2001.2
Chiral alpha -dibenzylamino aldehydes react with diethylaluminum cyanide leading to anti-beta -dibenzylamino-alpha -hydroxy-cyanides as the major diastereoisomers in good yields and diastereomeric excesses. Hydrolysis of the nitrile derivatives allows the synthesis of enantiopure beta -amino-alpha -hydroxy acids. (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthesis of Enantiopure <i>syn</i>-β-Amino Alcohols. A Simple Case of Chelation-Controlled Additions of Diethylzinc to α-(Dibenzylamino) Aldehydes
作者:José M. Andrés、Roberto Barrio、María A. Martínez、Rafael Pedrosa、Alfonso Pérez-Encabo
DOI:10.1021/jo960017t
日期:1996.1.1
Enantiomerically pure syn-2-amino alcohols 6 are prepared by addition of diethylzinc to chiral alpha-(dibenzylamino) aldehydes 4. The addition is highly stereoselective, leading to syn-2-(dibenzylamino) alcohols 5 with excellent diastereomeric excesses (76-98%). Debenzylation of 5 by hydrogenolysis on Pearlman's catalyst yields quantitatively the amino alcohols 6.