摘要:
An intramolecular aldol type of cyclization of the piperidine derivative 1 proceeded in highly stereoselective manner to afford the desired 4a,8a-cis-octahydroquinolin-7-one. This key step involves a feature of the use of A((1,3)) strain as a control element, in biasing 1 towards the conformer desired for the above cyclization. An application of this aldol reaction to enantioselective total synthesis of the marine alkaloid lepadin B is also described. (C) 1999 Elsevier Science Ltd. All rights reserved.