Preparation of Enantiopure Substituted Piperidines Containing 2-Alkene or 2-Alkyne Chains: Application to Total Syntheses of Natural Quinolizidine-Alkaloids
作者:Guolin Cheng、Xinyan Wang、Deyong Su、Hui Liu、Fei Liu、Yuefei Hu
DOI:10.1021/jo902615u
日期:2010.3.19
nonracemic Betti base as a chiral auxiliary. The key step is that the auxiliary residue was removed by a novel base-catalyzed N-debenzylation via a formation of o-quinone methide mechanism in stead of the traditional hydrogenolysis, by which the alkene or alkyne groups survived. By this method, ten 2-alkene- or 2-alkyne-containing chain substituted piperidines were prepared on the gram scale within
Biomimetic Organocatalytic Asymmetric Synthesis of 2-Substituted Piperidine-Type Alkaloids and Their Analogues
作者:Mattia R. Monaco、Polyssena Renzi、Daniele M. Scarpino Schietroma、Marco Bella
DOI:10.1021/ol2017406
日期:2011.9.2
Natural substances such as pelletierine and its analogues have been prepared in up to 97% ee and good yield by a protective-group-free, biomimetic approach. Usage of benzonitrile or acetonitrile as solvents effectively prevents product racemization.
Henry–Nef reaction: a practical and versatile chiral pool route to 2-substituted pyrrolidine and piperidine alkaloids
作者:Chinmay Bhat、Santosh G. Tilve
DOI:10.1016/j.tet.2013.05.055
日期:2013.7
for the synthesis of 2-substituted pyrrolidine and piperidine alkaloids containing 1,3-aminoketone and 1,3-amino alcohol units. The utility of the protocol is demonstrated by asymmetricsynthesis of 12 natural products of which asymmetricsynthesis of (−)-N-methylpelletierine is presented for the first time. The one-carbon homologation described also provides an alternate route for the synthesis of key
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.
Mannich‐type Reactions of Cyclic Nitrones: Effective Methods for the Enantioselective Synthesis of Piperidine‐containing Alkaloids
作者:Vladislav G. Lisnyak、Tessa Lynch‐Colameta、Scott A. Snyder
DOI:10.1002/anie.201809799
日期:2018.11.12
dozens of biologically active 2-substituted and 2,6-disubstituted piperidines, only a limited number of approaches exist for their synthesis. Herein is described two Mannich-type additions to nitrones, one using β-ketoacids under catalyst-free conditions and another using methyl ketones in the presence of chiral thioureas, which can generate a broad array of such 2-substituted materials, as well as other