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Using pentafluorophenyl as a Lewis acid to stabilize a cis secondary amide conformation
C C Forbes1, A M Beatty, B D Smith
1Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, USA.
Organic Letters
|October 27, 2001
Abstract:
[reaction: see text]. N-(pyrimidin-2-yl)pentafluorobenzamide adopts a cis amide bond in the solid state with a pyrimidyl nitrogen pointing toward the center of the perfluorophenyl ring. In solution, the compound is a mixture of cis and trans rotamers. The conformational equilibrium is strongly solvent dependent, and the cis rotamer is entropically favored. It is proposed that the entropic driving force is decreased solvation of the two aryl groups when in the cis conformation.