119
3.13 Ligularia knorringiana Pojarkova (= L. thyrsoidea)
and Ligularia narynensis (C. Winkler) O. Fedtschenko &
B. Fedtschenko
Two reports have been published [88, 235] on the chemical constituents of L. knorringiana (= L. thyrsoidea) [2] (samples 1 and 2 from the Xinjiang Autonomous
Region, China, but both seem the same source) (Table 16). Sample 1 afforded three
noreremophilanes (99 (knorringianalarin B), 101, and 121 (2- hydroxyplatyphilide)),
212 (furanoeremophilan-15,6α-olide), the intramolecularly Diels-Alder cyclized
compound knorringianalarin A (608), and the aromatic knorringianalarin C (912)
[88]. Sample 2 produced eight interesting oplopane sesquiterpenoids (knorringianalarin F (727), 728, 734, 749, knorringianalarin E (750), 751, knorringianalarin D
Fig. 44 Bisabolane-type sesquiterpenoids (3)
Chemical Constituents of Ligularia Species (Asteraceae) and Their Diversity…
3.13 Ligularia knorringiana Pojarkova (= L. thyrsoidea)
and Ligularia narynensis (C. Winkler) O. Fedtschenko &
B. Fedtschenko
Two reports have been published [88, 235] on the chemical constituents of L. knorringiana (= L. thyrsoidea) [2] (samples 1 and 2 from the Xinjiang Autonomous
Region, China, but both seem the same source) (Table 16). Sample 1 afforded three
noreremophilanes (99 (knorringianalarin B), 101, and 121 (2- hydroxyplatyphilide)),
212 (furanoeremophilan-15,6α-olide), the intramolecularly Diels-Alder cyclized
compound knorringianalarin A (608), and the aromatic knorringianalarin C (912)
[88]. Sample 2 produced eight interesting oplopane sesquiterpenoids (knorringianalarin F (727), 728, 734, 749, knorringianalarin E (750), 751, knorringianalarin D
Fig. 44 Bisabolane-type sesquiterpenoids (3)
Chemical Constituents of Ligularia Species (Asteraceae) and Their Diversity…