Dunetz JR, Xiang Y, Baldwin A, Ringling J. General and scalable amide bond formation with epimerization-prone substrates using T3P and pyridine.
Org Lett 2011;
13:5048-51. [PMID:
21875100 DOI:
10.1021/ol201875q]
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Abstract
The mild combination of T3P (n-propanephosphonic acid anhydride) and pyridine has been developed for low-epimerization amide bond formation and implemented for the synthesis of a key intermediate to a glucokinase activator. This robust method is general for the coupling of various racemization-prone acid substrates and amines, including relatively non-nucleophilic anilines, and provides amides in high yields with very low epimerization. With easy reaction setup and product isolation, this protocol offers several practical and experimental benefits.
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