A new lignan has been isolated from the whole plant extract of Daphne oleoides besides the known taxiresinol and lariciresinol. The structure of the new lignan was established as 4,9'-dihydroxy-3',4',5-trimethoxy-7',9-epoxylignan by spectroscopic methods. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
Short and Stereoselective Total Synthesis of Furano Lignans (±)-Dihydrosesamin, (±)-Lariciresinol Dimethyl Ether, (±)-Acuminatin Methyl Ether, (±)-Sanshodiol Methyl Ether, (±)-Lariciresinol, (±)-Acuminatin, and (±)-Lariciresinol Monomethyl Ether and Furofuran Lignans (±)-Sesamin, (±)-Eudesmin, (±)-Piperitol Methyl Ether, (±)-Pinoresinol, (±)-Piperitol, and (±)-Pinoresinol Monomethyl Ether by Radical Cyclization of Epoxides Using a Transition-Metal Radical Source
corresponding cyclized products. The furofuran lignans sesamin 2a, eudesmin 2b, and piperitol methyl ether 2e were also prepared directly by using the same precursors 4a-f on radicalcyclization followed by treatment with iodine and pinoresinol 2h, piperitol 2i, and pinoresinol monomethyl ether 2j after controlled hydrogenolysis of the benzyl protecting group of the corresponding cyclized products. Two
作者:Nisar Ullah、Saeed Ahmad、Erum Anis、Pir Mohammad、Hafiz Rabnawaz、Abdul Malik
DOI:10.1016/s0031-9422(98)00468-3
日期:1999.1
A new lignan has been isolated from the whole plant extract of Daphne oleoides besides the known taxiresinol and lariciresinol. The structure of the new lignan was established as 4,9'-dihydroxy-3',4',5-trimethoxy-7',9-epoxylignan by spectroscopic methods. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.