Abstract
The solid-state structure of a (±)-homonefopam hydrogenfumarate salt having an-O(CH2)3N-fragment was determined by single-crystal X-ray diffraction analysis. Homonefopam hydrogenfumarate gave crystals belonging to the monoclinicP21/c space group, and at ambient temperaturea=10.220(1),b=18.187(2),c=10.687(2)A,Β=94.43(1)‡,V=1980.5(5)å3 Z=4,R(F)=0.039,R w =0.039,R W (F)=0.025. The1H NMR spectrum of homonefopam hydrochloride in CD2Cl2 solution showed two species (7:1 ratio) at the prototropic shift-nitrogen inversion slow exchange limit. The solution-state major species has the same conformation andtrans-to-phenyl axial N-methyl disposition found in the crystal as evidenced by three antiperiplanar vicinal3 J (HH) coupling constants in the oxytrimethyleneamino fragment and vicinal coupling constants involving theN-H proton. TheR-ratio method was used to estimate 64(2)‡ O-C(3)-C(4)-C(5) and 75(3)‡ C(3)-C(4)-C(5)-N(6) dihedral angles for the major species in CD2Cl2 solution in accord with its proposed structure. The finding of C(3)-C(4) bond time-averaged magnitude3 J (HH) values and severe broadening of signals from other minor species protons suggests conformational heterogeneity for the solution-state minor species.
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Glaser, R., Shiftan, D. & Drouin, M. The stereochemistry of a nine-membered ring analogue of nefopam, a nonnarcotic analgesic drug. Struct Chem 6, 25–35 (1995). https://doi.org/10.1007/BF02263525
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DOI: https://doi.org/10.1007/BF02263525