Abstract
A partial synthesis of 7β-hydroxy-(−)-kaur-16-en-19-oic acid from 7β-hydroxykaurenolide is described utilizing the Meerwein-Ponndorf reduction of 7-oxo-(−)-kaur-16-en-19-oic acid. The NaBH 4 reduction of some 7-oxo-16,17-dihydroxykauranes is described. The effect of different conformations of ring B on the NMR spectra of these diterpenes is noted.
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