Lipase‐Catalyzed Esterification of a (±)‐2,3‐Di(Arylmethyl)‐1,4‐butanediol and Its Application to the Synthesis of (S,S)‐(+)‐Hinokinin
摘要:
Racemic trans-2,3-di[(3,4-methylenedioxy)benzyl]-1,4-butanediol (dihydrocubebin) 6 was enantioselectively esterified using lipases as catalysts with vinyl acetate. Optically active (SS)-1,4-butanediol 6 obtained was selectively oxygenated with a Fetizon reagent, affording (SS)-(+)-hinokinin 9 in a high yield.
Antiviral activity of arylnaphthalene and aryldihydronaphthalene lignans
作者:Christopher Cow、Carmen Leung、James L Charlton
DOI:10.1139/v00-059
日期:2000.5.1
2-dihydronaphthalene lignans is described. The method makes use of the classic Stobbe condensation followed by regioselective reactions that provide access to both the common and retrolactone lignans, e.g., 2 and 3. A total of 25 compounds, many of which are known natural products, were prepared and their antiviralactivity against human cytomegalovirus measured.Key words: lignan, Stobbe, arylnaphthalene
Formal synthesis of (−)-podophyllotoxin through the photocyclization of an axially chiral 3,4-bisbenzylidene succinate amide ester – a flow photochemistry approach
作者:Kamil Lisiecki、Krzysztof K. Krawczyk、Piotr Roszkowski、Jan K. Maurin、Zbigniew Czarnocki
DOI:10.1039/c5ob01844g
日期:——
We have developed a strategy for the stereoselective synthesis of cyclolignans related to podophyllotoxin and its derivatives. The crucial step of the synthesis is the photocyclization of a chiral atropoisomeric 1,2-bisbenzylidenesuccinate amide ester, which can be prepared from suitable aromatic aldehydes, diethyl succinate and L-prolinol. The photocyclization was found to be more efficient when irradiation