Structure of trans-methyl 2-phenylhexahydro-2H-isoxazolo (2,3-a)-pyridine-3-carboxylate

The title compound, a 1,3-dipolar cycloaddition product, crystallizes in the monoclinic space group P2₁/c, with a=8.199(3), b=16.908(1), c=10.248(2)Å, β=93.58(2)° and Z=4. The structure was solved by direct methods and refined by full matrix least squares methods to R=0.038 for 1687 observed reflections. The stereochemistry of this compound was found to have the "ee" conformation in the solid state as well as in solution. The piperidine ring in the molecule is in the chair form and the isoxazolidine ring adopts an envelope conformation.