Synthesis of chiral heterocycles by ligand-controlled regiodivergent and enantiospecific Suzuki Miyaura cross-coupling.

Abstract:

:Non-aromatic nitrogen- and oxygen-containing heterocycles such as piperidines and pyrans are prevalent components of natural products and pharmaceutical drugs. Although it has been a workhorse as a synthetic method for assembling unsaturated sp(2)-hybridized substrates, transition metal-catalysed cross-coupling chemistry is traditionally not a suitable approach to prepare chiral non-aromatic heterocycles. Several mechanistic issues hamper the coupling of stereogenic secondary sp(3)-hybridized carbon-metal centres. Moreover, use of unsymmetrical allylic boronates in the Suzuki Miyaura cross-coupling is further complicated by the possibility of forming two regioisomeric products. Here we address this two-pronged problem and demonstrate that chiral enantiomerically enriched heterocyclic allylic boronates can be coupled with high stereochemical retention with a wide variety of aryl and alkenyl halides to independently afford both regioisomeric 2- and 4-substituted dihydropyrans and dehydropiperidines in high selectivity. A divergent mechanism is proposed where regiochemistry is governed by the nature of the ligands on the palladium catalyst. This scalable method is applied to the efficient preparation of the neuroactive alkaloid anabasine and the antidepressant drug paroxetine.

journal_name

Nat Commun

journal_title

Nature communications

authors

Ding J,Rybak T,Hall DG

doi

10.1038/ncomms6474

subject

Has Abstract

pub_date

2014-11-18 00:00:00

pages

5474

issn

2041-1723

pii

ncomms6474

journal_volume

5

pub_type

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