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Molecules 2012, 17(2), 2119-2125; doi:10.3390/molecules17022119

Article

A New Bromoallene-Producing Chemical Type of the Red Alga Laurencia nangii Masuda

Takashi Kamada and Charles Santhanaraju Vairappan*

Laboratory of Natural Products Chemistry, Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, 88400 Kota Kinabalu, Sabah, Malaysia

* Author to whom correspondence should be addressed.

Received: 27 December 2011; in revised form: 8 February 2012 / Accepted: 13 February 2012 / Published: 21 February 2012

(This article belongs to the Section Natural Products)

Download PDF Full-Text [266 KB, Updated Version, uploaded 22 February 2012 16:23 CET]

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Abstract: Six populations of Laurencia nangii were found to produce three bromoallenes; dihydroitomanallene B (1), itomanallene B (2) and pannosallene (3). Prior to this report, L. nangii were only known to produce C₁₅-acetogenins with acetylene functionality. This could be regarded as a new chemical race of L. nangii. The compound structures were elucidated on the basis of spectroscopic analysis and comparison with those previously reported in literature. Compound 1, dihydroitomanallene B, was isolated as a new compound representing a minor variation of itomanallene B (2).

Keywords: Laurencia nangii; C₁₅-acetogenin; bromoallene; chemical race

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