Geodiamolide

Talpir R, Benayahu Y, Kashman Y. Pannell L, Schleyer M. (1994) Hemiasterlin and geodiamolide TA two new cytotoxic peptides from the marine sponge HemiastereUa minor (Kirkpatrick). Tetrahedron Lett 35 4453 456. 

Tinto WF, Lough AJ, McLean S, Reynolds WF, Yu M, Chan WR (1998) Geodiamolides H and I, Further Cyclodepsipeptides from the Marine Sponge Geodia sp. Tetrahedron 54 4451... 

Coleman JE, Van Soest R, Andersen RJ (1999) New Geodiamolides from the Sponge Cymbastela sp. Collected in Papua New Guinea. J Nat Prod 62 1137... 

Tyr substructures are, moreover, found within several peptidic antibiotics, for example the edeines 57 from Bacillus brevis, or within cyclodepsipeptides that have been isolated from marine sponges, for example jaspamides A-C 59 [106] or geo-diamolides H-I 58 [107] (Scheme 1.5.9). The chondramides 60 are closely related antibiotics that have been obtained from the myxobacterium Chondromyces croca-tus. Within the edeine biosynthesis D-/ -Tyr 9 seems to be a real precursor [89]. The biosynthesis of the jaspamides, the geodiamolides, or the chondramides has not yet been investigated. 

A similar enantioconvergent strategy is used for the construction of the hydroxy acid of the biologically active peptides geodiamolide A or jaspamide (jasplakinolide), isolated from lower marine organisms (sponges)442. 

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