Synthesis of enantiopure pyrrolidine and piperidine derivatives via ring closing metathesis
摘要:
The additions of lithiated allylsulfone carbanion to chiral N-sulfinylimines were found to proceed with good to excellent selectivity. The resulting intermediates 4a-d after transformation to dienylamides 7a-d and 16a-d, were converted to functionalized enantiopure piperidines and pyrrolines, respectively, via ring closing metathesis (RCM). (C) 2000 Elsevier Science Ltd. All rights reserved.
Asymmetric synthesis of functionalized piperidine derivatives: synthesis of (S)-anatabine
摘要:
A short and efficient chiral synthesis of 6-aryl-5-phenylsulfonyl-1,2,5,6-tetrahydropyridines was achieved in moderate yield and with good selectivity. The absolute configurations were assigned by extending the methodology to (S)-anatabine and as well with NMR experiments. (C) 1998 Elsevier Science Ltd. All rights reserved.