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The structures of paraensidimerin A and C, two bisquinolinone alkaloids from <i>Euxylophora paraensis</i>
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1982
Year
Single-crystal X-ray diffraction studies and n.m.r. spectral measurements have now shown structure of paraensidimerin A, a bisquinolinone alkaloid from the heartwood of Euxylophora paraensis (Rutaceae), to be (6aa,7ß,15ß,16aa)-(±-6,6,9,15,18-pentamethyl-6,6a,7,9,15,16,16a,18-octahydro-7,15-methano-8 H ,17 H -quino[3',4' :5',6'] pyrano[3',4':5,6] oxocino[3,2-c] quinoline-8,17-dione (8). Paraensidimerin C is a stereoisomer, (6aa,7ß,15ß,16aß)-(±)-6,6,9,15,18-pentamethyl-9,15,16,16a,18-octahydro-7,15-methano-8 H ,17 H -quino [3',4':5',6'] pyrano [3',4': 5,6] oxocino [3,2-quinoline-8,17-dione (9). Possible biosynthetic routes to these and other dimeric quinolinone alkaloids are suggested.