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Org Lett. 2009 Jan 15;11(2):433-6. doi: 10.1021/ol802482d.

A facile deprotection of secondary acetamides.

Organic letters

Stefan G Koenig, Charles P Vandenbossche, Hang Zhao, Patrick Mousaw, Surendra P Singh, Roger P Bakale

Affiliations

  1. Chemical Process Research and Development, Sepracor Inc., 84 Waterford Drive, Marlborough, Massachusetts 01752, USA. [email protected]

PMID: 19128192 DOI: 10.1021/ol802482d

Abstract

Imidoyl chlorides, generated from secondary acetamides and oxalyl chloride, can be harnessed for a selective and practical deprotection sequence. Treatment of these intermediates with 2 equiv of propylene glycol and warming enables the rapid release of amine hydrochloride salts in good yields. Notably, the reaction conditions are mild enough to allow for a swift deprotection with no observed epimerization of the amino center.

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