ChemInform Abstract: A New Lobane Diterpene Acid from the Soft Coral Lobophytum microlobulatum of the Andaman and Nicobar Islands.

Abstract

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Tricyclic Sesquiterpenes from Marine Origin

“…It was later found in the soft corals Sinularia leptoclados (coast of Mandapam, Mannar Island), Sinularia capillosa (Sanya Bay, South China Sea), Sinularia sp. (Putti Island and Kurshide Island, Mandapam Coast, Indian Ocean), , Sinularia conferta (Andaman and Nicobar Islands), Sinularia hirta (Andaman and Nicobar Islands, at the juncture of the Bay of Bengal and Andaman Sea), Sinularia kavarattiensis (Mandapam coast, India), , Lobophytum pauciflorum (Havalock Island, Indian Ocean), and Lobophytum strictum (Andaman and Nicobar Islands) …”

“…(Putti Island and Kurshide Island, Mandapam Coast, Indian Ocean), 161,162 Sinularia conferta (Andaman and Nicobar Islands), 163 Sinularia hirta (Andaman and Nicobar Islands, at the juncture of the Bay of Bengal and Andaman Sea), 164 Sinularia kavarattiensis (Mandapam coast, India), 165,166 Lobophytum paucif lorum (Havalock Island, Indian Ocean), 167 and Lobophytum strictum (Andaman and Nicobar Islands). 168 It was also isolated together with the known terrestrial sesquiterpene (+)-Δ 7(8) -africanene 145 (1-africanene) from the aeolid nudibranch Phyllodesmium magnum collected from South China Sea 169 and the soft coral Sinularia dissecta (Madapam Coast, India). 170 A study of the latter also afforded (+)-144 171 together with the oxygenated africananes 146 and 147 and (+)-(9S)-africanane-9,15-diol 148.…”

New Lobane and Cembrane Diterpenes from Two Comorian Soft Corals

“…Only one other publication mentions the coexistence of lobane and cembrane diterpenoids in a soft coral: fuscol and isofuscol were isolated with 11, 12-epoxycembra-1, 3, 7-triene, decaryol and 3, 4-epoxycembra-7, 11-dien-15-ol from Lobophytum microlobulatum [ 22 ]. The co-occurrence of lobane with sesquiterpenes (Δ 9(15) -africanene [ 5 , 23 ], 15-nor-13-keto-β-elemene [ 5 , 21 , 24 ]) or with steroids [ 5 , 6 , 21 , 25 , 26 ] has also been reported. Until now, lobanes have been exclusively isolated from the Gorgonian species Eunicea fusca [ 2 ] and from the soft corals of the genera Lobophytum [ 3 – 6 ] and Sinularia [ 7 – 9 , 27 ].…”