DITERPENES OF CALIBRACHOA-PARVIFLORA

Leaves of Calibrachoa parviflora gave the kauranoids corymbol 6-monoacetate [4] and corymbol 17-monoacetate [5], corymbol 17-(2-methylbutyrate) [6], and corymbol 6-acetate-17-(2-methylbutyrate) [8]. Other new kauranoids were ent-kaurane-7alpha, 16beta,17-triol [9], its 7-acetate [10], and its 7-acetate-17-(2-methylbutyrate) [11), the corresponding 7-ketodiol [12] and its 17-acetate [13]. New pimaranes were 15R,16-dihydroxy-ent-isopimar-8(14)-en-7-one [14] and the ring-closed analogues, 14alpha,16-oxido-ent-isopimar-7-en-15alpha-ol [17] and 14alpha, 16-oxido-ent-isopimar-7-ene-6alpha,15alpha-diol [20]. The known diterpenes, ent-kaurane-16beta,17-diol, its 17-acetate, ent-kaurane-6alpha,16beta,17-triol (corymbol), and its 6,17-diacetate were also obtained. C. parviflora did not yield any of the ergostanoids that are characteristic of Petunia species, thus supporting its recent reassignment into a separate genus.