(R,R)-2,3-Disubstituted piperidines were readily synthesized starting from
(R)-(+)- 5-bromo-2-hydroxypentanenitrile (R)-2. An enantioselective (R)-oxy
nitrilase-catalyzed transcyanation was used to prepare the starting cyanohy
drin (R)-2. (C) 2001 Elsevier Science Ltd. All rights reserved.