Unknown

Dataset Information

0

Proton donor acidity controls selectivity in nonaromatic nitrogen heterocycle synthesis.


ABSTRACT: Piperidines are prevalent in natural products and pharmaceutical agents and are important synthetic targets for drug discovery and development. We report on a methodology that provides highly substituted piperidine derivatives with regiochemistry selectively tunable by varying the strength of acid used in the reaction. Readily available starting materials are first converted to dihydropyridines via a cascade reaction initiated by rhodium-catalyzed carbon-hydrogen bond activation. Subsequent divergent regio- and diastereoselective protonation of the dihydropyridines under either kinetic or thermodynamic control provides two distinct iminium ion intermediates that then undergo highly diastereoselective nucleophilic additions. X-ray structural characterization of both the kinetically and thermodynamically favored iminium ions along with density functional theory calculations provide a theoretical underpinning for the high selectivities achieved for the reaction sequences.

SUBMITTER: Duttwyler S 

PROVIDER: S-EPMC3809088 | biostudies-literature | 2013 Feb

REPOSITORIES: biostudies-literature

altmetric image

Publications

Proton donor acidity controls selectivity in nonaromatic nitrogen heterocycle synthesis.

Duttwyler Simon S   Chen Shuming S   Takase Michael K MK   Wiberg Kenneth B KB   Bergman Robert G RG   Ellman Jonathan A JA  

Science (New York, N.Y.) 20130201 6120


Piperidines are prevalent in natural products and pharmaceutical agents and are important synthetic targets for drug discovery and development. We report on a methodology that provides highly substituted piperidine derivatives with regiochemistry selectively tunable by varying the strength of acid used in the reaction. Readily available starting materials are first converted to dihydropyridines via a cascade reaction initiated by rhodium-catalyzed carbon-hydrogen bond activation. Subsequent dive  ...[more]

Similar Datasets

| S-EPMC2904050 | biostudies-literature
| S-EPMC5740077 | biostudies-literature
| S-EPMC6149747 | biostudies-literature
| S-EPMC6429512 | biostudies-literature
| S-EPMC9318235 | biostudies-literature
2022-01-13 | PXD029006 | Pride
| S-EPMC6856796 | biostudies-literature
| S-EPMC2855696 | biostudies-literature
| S-EPMC8159430 | biostudies-literature
| S-EPMC9490819 | biostudies-literature