The Crystal Structure and Absolute Configuration of O,O-Dimethylipecoside

Abstract

O,O-Dimethylipecoside is orthorhombic, space group C2221, with a = 29.57 (3), b = 825 (1), c = 29.52 (3) A, Z = 8. The structure was solved by tangent formula refinement of diffractometer data collected with Cu radiation. Full-matrix least-squares refinement resulted in a final R of 0.141 for 2159 reflexions. The dihydroisoquinoline ring has the expected geometry. The dihydropyranyl ring is a ‘half-chair’ and the glucose ring is in the chair form. The absolute configuration was assigned from the knowledge that hydrolysis of ipecoside yields d-glucose.