摘要:
An intramolecular Mannich reaction, involving cyclanones together with a ketoprotected aminobutanone in the presence of a Lewis acid, is employed to prepare rapidly 2,2 ' -spiropiperidine skeletons. Phis approach is validated through a concise and efficient synthesis of spiro [piperidine-2,2 ' -adamantane] 4, an antiviral agent. (C) 2001 Elsevier Science Ltd. All rights reserved.