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Title:   Author  item
                                            NAKANO, HIROSHI - National Agricultural Research Organization - Japan (NARO)item
                                            Cantrell, Charlesitem
                                            MAMONOV, LEONID - Institute Of Plant Biology And Biotechnologyitem
                                            Osbrink, Westeitem
                                            ROSS, SAMIR - University Of Mississippi
  Submitted to: Organic Letters
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 10/15/2011
                                    Publication  Date: 11/8/2011
                                    Citation: Nakano, H., Cantrell, C.L., Mamonov, L.K., Osbrink, W.L., Ross, S. 2011. Echinopsacetylenes A and B, new thiophenes from Echinops transiliensis. Organic Letters. 13(23):6228-6231.Interpretive Summary: Many Echinops and Tagetes species have been investigated resulting in the isolation of many bioactive thiophenes. In our continuing study of the thiophenes from Echinops species, we isolated two new compounds from Echinops transiliensis.  Echinopsacetylene A is the first natural product possessing an alpha-terthienyl moiety covalently linked with another thiophene moiety, which is essentially a new carbon skeleton. Echinopsacetylene B is the first natural thiophene conjugated with a fatty acid moiety.  One of the compounds, echinopsacetylene A, showed toxicity against the Formosoan subterranean termite (Coptotermes formosanus
                                Technical Abstract: Two new polyacetylene thiophenes, echinopsacetylenes A and B (1 and 2), were isolated from the root of Echinops transiliensis. The structures of 1 and 2 were elucidated on the basis of spectroscopic analyses and chemical transformations. Echinopsacetylene A (1) is the first natural product possessing an '-terthienyl moiety covalently linked with another thiophene moiety. Echinopsacetylene B (2) is the first natural thiophene conjugated with a fatty acid moiety. Echinopsacetylene A (1) showed toxicity against the Formosoan subterranean termite (Coptotermes formosanus).


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