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Synthetic approaches towards new condensed thienopyridine ring systems including furo[2,3-b]thieno[3,2-e]pyridines, bisthieno[2,3-b:3',2'-e]pyridines, 5H-chromeno[2,3-b]thieno[3,2-e]pyridines, 5H-benzo(f)chromeno[2,3-b]thieno[3,2-e]pyridines have been achieved by application of intramolecular 4+2 cycloaddition reactions of suitably designed thieno[2,3-e][1,2,4]triazines tethered with alkene or alkyne...
The extract of the leaves of Jasonia candicans yielded, seven new sesquiterpenes and sesquiterpene lactones including a eudesmane containing a rare type of 6/6/4 membered ring system, two 7-epi-eudesmanes (12-hydroxyisointermedeol and 7-epi-ilicic acid), two guaianolides (inuviscolide and its 8-epi- derivative), iphionane and cadinane-triol derivatives. The structures were elucidated by spectroscopic...
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