Steroids from the soft coral Dendronephthya sp.
- Li, GQ
- Deng, ZW
- Guan, HS
- van Ofwegen, LP
- Proksch, P
- Lin, WH
DOIAbstract
Fifteen steroids were isolated from the soft coral Dendronephthya sp., of which five are determined as new compounds, namely (22E)-3-O-beta-formylcholest-5,22-diene (1), (22E)-3-O-beta-formyl-24-methyl-cholest-5.22-diene (2), 2-ethoxycarbonyl-2-beta-hydroxy-A-nor-cholest-5-ene-4-one (3), (22E)-2-ethoxycarbonyl-2-beta-hydroxy-A-nor-cholest-5,22-diene-4-one (4). and (22E)-2-ethoxycarbonyl'2-beta-hydroxy-24-mthyl-A-nor-cholest-5.22-diene-4- one (5). 1 and 2 belonged to 3-O-formylated cholesterol analogues, and 3 to 5 are unique ring A-contracted steroids. Their structures were elucidated by extensive 2D NMR in association with IR MS analysis. (C) 2004 Elsevier Inc. All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?...
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