Austocystins. Six novel dihydrofuro[3′,2′:4,5]furo[3,2-b]xanthenones from Aspergillus ustus
- 1 January 1974
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 19,p. 2250-2256
- https://doi.org/10.1039/p19740002250
Abstract
Extraction of maize meal cultures of Aspergillus ustus gave six novel metabolites, designated austocystins, to which were assigned the substituted 3a, 12a-dihydrofuro[3′,2′:4,5]furo[3,2-b]xanthen-5-one structures (1), (20), (21), (23), (26), and (29). The substitution pattern of the austocystins was confirmed by the results of chemical degradation as well as by use of n.m.r. techniques such as acetylation shifts, benzene-induced solvent shifts, and nuclear Overhauser effect experiments.Keywords
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