Huichun Zhu, M. Plewe, A. Rheingold
Dec 16, 2009
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Acta Crystallographica Section E: Structure Reports Online
Abstract
rac-Benzyl 3-oxohexahydro-1H-pyrrolo[3,4-c]pyridine-5(6H)-carboxylate was separated by chiral chromatography, and one of the enantiomers ([α]22 D = +10°) was hydrogenated in the presence of Pd/C in methanol, producing octahydro-3H-pyrrolo[3,4-c]pyridin-3-one. The latter was reacted with (2R)-3,3,3-trifluoro-2-methoxy-2-phenylpropanoyl chloride [(R)-(−)-Mosher acid chloride], giving rise to the title compound, C17H19F3N2O3·H2O. The present structure established the absolute configuration of the pyrrolopiperidine fragment based on the known configuration of the (R)-Mosher acid chloride. The piperidine ring has a somewhat distorted chair conformation and is cis-fused with the five-membered envelope-shaped ring; the plane of the exocyclic amide bond is approximately orthogonal to the plane of the phenyl ring, making a dihedral angle of 82.31 (3)°. The water molecule acts as an acceptor to the proton of the amino group in an N—H⋯O interaction, and as a double proton donor in O—H⋯O hydrogen bonds, generating infinite bands along the a axis.