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Org Lett. 2009 Mar 5;11(5):1095-8. doi: 10.1021/ol802932v.

Synthesis of gamma-amino esters via Mn-mediated radical addition to chiral gamma-hydrazonoesters.

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  • 1Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, USA. gregory-friestad@uiowa.edu

Abstract

Highly stereoselective Mn-mediated couplings of alkyl iodides with chiral N-acylhydrazones bearing ester functionality afford a series of gamma-hydrazino esters, including gamma-substituted, alpha,gamma-disubstituted, and alpha,alpha,gamma-trisubstituted examples. In contrast to prior work with chiral N-acylhydrazones, high stereoselectivity was observed even in the absence of Lewis acid. Microwave-assisted acylation with trifluoroacetic anhydride and reductive N-N bond cleavage provided the gamma-amino ester functionality in a synthetically useful N-TFA-protected form.

PMID:
19199819
[PubMed - indexed for MEDLINE]
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