Coelho A, Behr JB, Vasse JL. Access to 5-bromopentanal and 6-bromohexanal derivatives
via the bromination/hydrolysis of C,O-bis-zirconocenes generated from unsaturated Weinreb amides.
Org Biomol Chem 2022;
20:5803-5811. [PMID:
35833893 DOI:
10.1039/d2ob01073a]
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Abstract
Access to 5-bromopentanal and 6-bromohexanal derivatives from Weinreb amides is described. The method relies on the sequential C-bromination/zircona-aminal hydrolysis of bis-C,O-zirconocenes, which are generated in situ from unsaturated Weinreb amides using Schwartz's reagent. Synthetic illustrations of such bromo-aldehydes, which can act as carbocycle and heterocycle precursors, are also presented.
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