Enantioselective synthesis of (S)-1,6,7,8,9,9a-hexahydroquinolizin-4-one. Formal synthesis of the lycopodium alkaloids senepodine G and cermizine C
摘要:
The synthesis of the title compound, a key intermediate in the synthesis of some lycopodium and lupin alkaloids, is reported. From a stereochemical standpoint the key steps are the stereoselective cyclocondensation of ketodiester 1 with (R)-phenylglycinol and the stereocontrolled reduction, with retention of configuration, of the oxazolidine ring in the resulting oxazolopiperidone lactam 2. (C) 2008 Elsevier Ltd. All rights reserved.