Constituents of Dragon's blood. Part I. Structure and absolute configuration of new optically active flavans
- 1 January 1971
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society C: Organic
- p. 3967-3970
- https://doi.org/10.1039/j39710003967
Abstract
Dragon's blood resin has yielded six new natural substances, (2S)-5-methoxy-6-methylflavan-7-ol (1), (2S)-5-methoxyflavan-7-ol (2), the quinone methides nordracorhodin (6) and nordracorubin (10), 2,4-dihydroxy-5-methyl-6-methoxychalcone (7), and 2,4-dihydroxy-6-methoxychalcone (8). Their structures have been determined by physical methods and chemical interconversions. The absolute 2S configuration for flavans (1) and (2) has been established by comparison of c.d. data with those for synthetic (2R)-flavan-7-ol (14).Keywords
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