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Mar. Drugs, Volume 3, Issue 3 (September 2005), Pages 78-112

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Editorial

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Open AccessEditorial Withdrawn Paper: Rajeev Kumar Jha * and Xu Zi-Rong. Review: Biomedical Compounds from Marine Organisms, Marine Drugs 2004, 2, 123-146
Mar. Drugs 2005, 3(3), 112; doi:10.3390/md303112
Received: 25 October 2005 / Published: 27 October 2005
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Research

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Open AccessArticle Polycitorols A and B, New Tricyclic Alkaloids from an Ascidian
Mar. Drugs 2005, 3(3), 78-83; doi:10.3390/md303078
Received: 24 January 2005 / Accepted: 13 June 2005 / Published: 23 September 2005
Cited by 11 | PDF Full-text (43 KB) | HTML Full-text | XML Full-text
Abstract
Two new tricyclic alkaloids, polycitorols A (1) and B (2) have been isolated along with the known lepadiformine (3) from a marine ascidian of the family Polycitoridae. The structures of the new compounds were elucidated by analysis of NMR data and comparison [...] Read more.
Two new tricyclic alkaloids, polycitorols A (1) and B (2) have been isolated along with the known lepadiformine (3) from a marine ascidian of the family Polycitoridae. The structures of the new compounds were elucidated by analysis of NMR data and comparison with those of 3 and other related compounds [1-5]. Compounds 1 and 2 are closely related to cylindricines A and B, lacking C-4 oxygenation found in cylindricines and having a butyl instead of a hexyl appendage. NOE experiments on compounds 1 and 2 suggested the A/B ring fusion to be cis. Full article

Review

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Open AccessReview Sterol Ring System Oxidation Pattern in Marine Sponges
Mar. Drugs 2005, 3(3), 84-111; doi:10.3390/md303084
Received: 31 January 2005 / Accepted: 7 June 2005 / Published: 7 June 2005
Cited by 26 | PDF Full-text (212 KB) | HTML Full-text | XML Full-text
Abstract
The marine sponges (Porifera) are a unique group of sedentary organisms from which several novel natural products are reported, many of which have useful biological activities. In producing unusual sterols, they occupy a preeminent position among the various groups of organisms. The [...] Read more.
The marine sponges (Porifera) are a unique group of sedentary organisms from which several novel natural products are reported, many of which have useful biological activities. In producing unusual sterols, they occupy a preeminent position among the various groups of organisms. The polar sterols of sponges reported as at the end of the year 2002 number about 250; their ring structure changing a hundred times. The oxidation pattern in the sterol ring system, from the point of view of biogenesis seems to be mainly of four types. Each sponge species is able to produce sterols fitting into one of the four main biogenetic pathways viz., (i) 3β-hydroxy-Δ5-sterol pathway, (ii) 3β-hydroxy-Δ7-sterol pathway, (iii) 3β-hydroxy-Δ5,7-sterol pathway, and (iv) 3α-hydroxy sterol pathway. Full article

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