A highly stereocontrolled route to 2-(2′-oxiranyl)piperidines and pyrrolidines: enantioselective synthesis of (+)-α-conhydrine
摘要:
The first enantio- and diastereoselective approach to both 2-(2'-oxiranyl)piperidines and to 2-(2'-oxiranyl)pyrrolidines is reported. The method relies on the Sharpless asymmetric epoxidation of allyl alcohols as the sole source of chirality, and involves as the key step the base-mediated cyclization of (alpha-aminoalkyl)oxiranes functionalized at the is an element of (or delta) position. The asymmetric synthesis of (+)-alpha-conhydrine illustrates the applicability of this strategy to the preparation of biologically active 2-(1-hydroxyalkyl)piperidine alkaloids. (c) 2008 Elsevier Ltd. All rights reserved.
Synthetic Studies of Alkaloids Containing Pyrrolidine and Piperidine Structural Motifs
作者:Chinmay Bhat
DOI:10.1002/open.201402128
日期:2015.4
Avenues to asymmetricalkaloids! Various 2‐substituted pyrrolidine and piperidine chiral bioactive natural products were synthesized using a ‘chiral pool’ method. l‐proline and l‐pipecolinic acids with one chiral center served as the best precursors for the synthesis of these alkaloids. Overall, 14 total synthetic and 11 formal synthetic approaches were developed.