El Gharbi M, Bianchi E, Coelho A, Kowandy C, Behr JB, Vasse JL. Bis-zirconocenes Generated from Weinreb 2-Allylaminoacetamides as Key Intermediates for a Diastereoselective Approach to 2- and 6-Substituted-3-Aminopiperidines.
J Org Chem 2025;
90:4134-4139. [PMID:
40085798 DOI:
10.1021/acs.joc.4c02399]
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Abstract
The synthesis of 2- and 6-substituted-3-aminopiperidines from Weinreb amides containing an allylamino fragment is reported. Involving the simultaneous hydrozirconation of the C═C and the C═O bonds, the cyclization was promoted by the BF3-mediated generation of an iminium. Proven to be highly diastereoselective, the sequence can be applied to diversely substituted unsaturated Weinreb amides and valorized through the preparation of bicyclic heterocycles.
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