A simple and efficient enantioselective synthesis of piperidine alkaloids dihydropinidine and isosolenopsins A, B and C
摘要:
A diastereospecific intramolecular Mannich-type reaction, involving enantiopure amine 4 and achiral aldehydes, is employed as the key step of an efficient total enantioselective synthesis of five piperidine alkaloids. (C) 2000 Elsevier Science Ltd. All rights reserved.
A new asymmetric synthesis of 2,6-cis-disubstituted 4-methylenepiperidines: total synthesis of (+)-alkaloid 241D and (+)-isosolenopsin A
摘要:
A highly diastereoselective synthesis of 2,6-cis-disubstituted-4-methylenepiperidines based on a Mannich type intramolecular cyclization of an allylsilane on an iminium ion is described. The synthetic potential of this methodology is demonstrated by the enantioselective synthesis of two natural piperidine alkaloids: (+)-alkaloid 241 D and (+)-isosolenopsin A. (C) 2005 Elsevier Ltd. All rights reserved.