Jungermannia infusca

A number of kauranoid diterpenoids have been isolated from the liverworts. (16i )-ent-Kauran-15-one, ent-15a-hydroxykaur-16-ene, and the corresponding 15-ketone have been isolated from the liverwort Jungermannia infusca and (16i )-ent-18-hydroxykauran-15-one, ent-kaur-16-en-18-oic acid, and ent- a-hydroxykaur-16-en-15-one have been found in another species, Porella densi-folia. The full paper on the crystal structure of enf-1 la,15or-dihydroxykaur-16-ene, which has been obtained from Jungermannia sphaerocarpa and Solenostoma trista, has appeared. ... 

Kaurenoid Diterpenoids.—ent-1 la-Acetoxykaur-16-en-15-one and its dihydroderivative have been obtained from the liverwort Jungermannia infusca. ent-Kaur-16-en-19-oic acid has been detected in a number of Stevia (Compositae) species, and ent-3j8-acetoxy- and ent-lla-acetoxy-kaur-16-en-19-oic acids have been isolated from Helichrysum cooperii (Compositae). ent-16/8-Hydroxy-... 

From Jungermannia infusca, e f-kauren-15-one (498), ( 6R)-ent-kauran-15-one (501) and /-15a-hydroxykaurene (504) have been obtained. Structures were confirmed by comparison of properties with those of substances previously known only as the result of chemical transformations and not as natural products (213). Later work on the diterpenoids of J. infusca resulted in the isolation of two previously known kaurane-type ketoalcohols (499, 502) and their acetates (500, 503) (246), the latter being new natural products. 

Matsuo, A., J. Kodama, M. Nakayama, and S. Hayashi Ent-Kaurane Diterpenoids from the Liverwort Jungermannia infusca. Phytochem. 16, 489 (1977). 

From the comparative study of the diterpenoids, the genus Jungermannia is divided into two types a labdane-pimarane-type (erect stem type, such as Jungermannia rosulans, J. thermarum and J. torticalyx) and a kaurane-type [creeping stem type, J. infusca and J. tristis ( = /. atrovirens)] (228). 

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