Oxidative transformations of guaia-1(10)-en-12,8-olides into xanthanolides
Dihydropsuedoivalin (1) was isolated from Stevia tomentosa, which, when treated with base, afforded epidihydropseudoivalin (2). The stereochemistry of 1 and 2 was established by crystallographic X-ray studies of the two derivatives of epidihydropseudoivalin. Treatment of 1 and 2 with Jones's reagent afforded the xanthanolides 3 and 4, respectively.
Instituto de Quimica, Universidad Nacional Autonoma de Mexico, Circuito Exterior, Ciudad Universitaria Coyoacan 04510, Mexico D. F., Mexico, and Departamento de Ciencias Quimicas FES-C, Universidad Nacional Autonoma de Mexico.
M
Martinez-Vazquez
J
Cardenas
L
Godoy
M
Martinez-Bahena
R
Miranda
Salm n M