(3S)-2,3,4,10-Tetrahydro-3-hydroxy-2,2,10-trimethyl-5H-pyrano[2,3-b]quinolin-5-one

Description

A further pyranoquinolone alkaloid found in the trunk bark of Balfourodendron riedelianum (Engler) Engler, the base may be recrystallized from MeOH-diiso_x0002_propyl ether or EtOH when it forms colourless prisms from the former and irregularly-shaped crystals from the latter. The ultraviolet spectrum in neutral solution (EtOH) has absorption maxima at 237,314 and 326 mf.1, while in acid solution (0.3 N/HCl) there are two maxima at 236 and 300 mf.1. The structure has been established as 3:4: S: 1 0-tetrahydro-3-hydroxy-2:2 :20-trimethyl-S-oxo- 2H-pyrano 2,3-b quinolone.

References

Corral, Orazi., Tetrahedron Lett., S83 (1967)
Synthesis:
Bowman, Grundon., 1. Chem. Soc., C, IS04 (1966)