Diastereodivergent Chiral Synthesis of the Furofuran Lignans (+)-Sesamin and (−)-Asarinin
作者:Kiyohiro Samizu、Kunio Ogasawara
DOI:10.1246/cl.1995.543
日期:1995.7
Two diastereomeric lignans (+)-sesamin and (−)-asarinin have been prepared diastereodivergently via the common intermediate generated by the chirotopical Heck reaction.
Lewis Acid-Catalyzed Vinyl Acetal Rearrangement of 4,5-Dihydro-1,3-dioxepines: Stereoselective Synthesis of <i>cis-</i> and <i>trans-</i>2,3-Disubstituted Tetrahydrofurans
作者:Arun K. Ghosh、Miranda R. Belcher
DOI:10.1021/acs.joc.0c00390
日期:2020.8.21
requisite substrates for the vinyl acetal rearrangement were synthesized via ring-closing olefin metathesis of bis(allyoxy)methyl derivatives using Grubbs second-generation catalyst followed by olefin isomerization using a catalytic amount of RuCl2(PPh3)3. We examined the substrate scope using substituted aromatic and aliphatic derivatives. Additionally, the rearrangement was utilized in the synthesis of a
A concise diastereoselective route to racemic samin, the general furofuran lignan precursor
作者:Seiichi Takano、Kiyohiro Samizu、Kunio Ogasawara
DOI:10.1039/c39930001032
日期:——
Exposure of the dihydro-1,3-dioxepine 5 to diisobutylaluminum hydride induces concurrent diastereoselective ring-contraction and reduction to lead to the trisubstituted tetrahydrofuran, oxidative cleavage of which gives (±)-samin1, the general furofuran lignan precursor.