Diterpenoids from Calceolaria inamoena.
Four 9-epi-ent-labdanes were isolated from the aerial parts of Calceolaria inamoena. Their structures, 2beta-hydroxy-9-epi-ent-labda8(17)-13(E)dien-15-oic acid, 2beta-hydroxy-9-epi-ent-labda8(17)-13(Z)dien-15-oic acid, 2beta-hydroxy-9-epi-ent-labda8(17)-13(E)dien-15-al and 2beta-hydroxy-9-epi-ent-labda-8(17)-13(Z)dien-15-al, were established by spectroscopic methods including by analysis of 2 dimensional heteronuclear correlation experiments 1H/13C (normal and long range), and NOE and gs-sel-1D-NOESY and TOCSY of their methyl ester or acetyl derivatives.
Garbarino
Juan A
JA
Departamento de Química, Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile. juan.garbarino@usm.cl
Chamy
María Cristina
MC
Piovano
Marisa
M
Espinoza
Luis
L
Belmonte
Eliana
E
D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D035261:Plant Components, Aerial / Q000737:chemistry; D028083:Scrophulariaceae / Q000737:chemistry*
D004224:Diterpenes