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Benzofuranoid neolignans from Piper kadsura

Benzofuranoid neolignans from Piper kadsura

Acta Botanica Sinica 35(9): 687-692

In a continuing research for neolignans from Piper kadsura (Choisy) Ohwi, six benzofuranoid neolignans were isolated from the aerial part of the plant. Their structure determination were based on the spectroscopic analysis (UV, IR, MS, NMR and CD) and derivative synthesis. Three of the isolated compounds were identified as new structures: 7R, 8R, 1'S-DELTA-8-3, 4-methylenedioxy-5'-methoxy-1', 4'-dihydro-4'-oxo-7.0. 2', 8.1'-neolignan (I) 7R,8R,1'R-DELTA-8'-3,4-methylenedioxy-1'-methoxy-1', 6'-dihydro-6'-oxo-7. 0.4', 8. 3'-neolignan (IV) and 7R, 8R, 1'S-DELTA-8-3, 4-methylenedioxy-1'-methoxy-1', 6'-dihydro-6'-oxo-7. 0.4', 8.3'-neolignan (V). Known compounds among them are 7R, 8S, 1'S-DELTA-8-3, 4-methylenedioxy-5'-methoxy-1', 4'-dihydro-4'-oxo-7. 0. 2', 8. 1'-neolignan (II), 7S, 8S, 1'R-DELTA-8-3, 4, 5'-trimethoxy-1',4'-dihydro-4'-oxo-7. 0. 2',8.1'-neolignan (III) and 7S, 8S, 1'S-DELTA-8-3, 4, 1'-trimethoxy-1', 6'-dihydro-6'-oxo-7. 0. 4', 8. 3'- neolignans (VI). All of them were isolated from the plant for the first time.

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