Direct transacylation of 2,2,2-trihaloethyl esters with amines and alcohols using phosphorus (III) reagents for
J J Hans1, R W Driver, S D Burke
1Department of Chemistry, University of Wisconsin-Madison 53706-1369, USA.
Abstract:
Amides and esters have been synthesized from 2,2,2-trihaloethyl esters in one pot using phosphorus-(III) reagents as reductants, with resultant carboxylate activation as an acyloxyphosphonium intermediate, and in situ trapping by amine or alcohol nucleophiles. Secondary and tertiary amides were synthesized, including a dipeptide, in good yields using hexamethylphosphorous triamide (Me2N)3P, as reducing agent. Optimal yields of esters derived from primary and secondary alcohols were obtained using tributylphosphine and DMAP. Tribromoethyl esters provided yields superior to those obtained with trichloroethyl esters.
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