Angularly Fused Triquinanes from Linear Substrates through Trimethylenemethane Diyl [2 + 3] Cycloaddition Reaction
作者:Hee-Yoon Lee、Yongsik Jung、Yeokwon Yoon、Byung Gyu Kim、Yeonjoon Kim
DOI:10.1021/ol100907t
日期:2010.6.4
Angularly fused triquinanes were synthesized from linear dienes and phenyl(propynyl)iodonium salt through trimethylenemethane (TMM) diyl mediated [2 + 3] cycloadditionreaction. TMM diyl intermediates were obtained from alkylidene carbenes generated fromreactions of alkynyliodonium salts with nucleophiles.
Radical [<i>n</i> + 1] Annulations with Sulfur Dioxide
作者:Anna Tsimelzon、Rebecca Braslau
DOI:10.1021/jo052035t
日期:2005.12.1
A new methodology for [n + 1] radical annulation using sulfurdioxide as a geminal radical acceptor/donor is presented. This methodology provides a novel route to the formation of five-, six-, and seven-membered cyclic sulfones utilizing a radical chain mechanism under very mild conditions.
提出了一种使用二氧化硫作为双基自由基受体/供体的[ n +1]自由基环化的新方法。这种方法学为在非常温和的条件下利用自由基链机理形成五元,六元和七元环状砜提供了一条新颖的途径。
Enantioselective Synthesis of the Tricyclic Core of FR901483 Featuring a Rhodium-Catalyzed [2+2+2] Cycloaddition
作者:Tomislav Rovis、Stéphane Perreault
DOI:10.1055/s-0032-1316786
日期:——
Abstract An efficient approach to the tricyclic framework of FR901483 is described. The sequence features a [3,3]-sigmatropic rearrangement of a cyanate to an isocyanate, followed by its subsequent asymmetric rhodium-catalyzed [2+2+2] cycloaddition with a terminal alkyne for the synthesis of the indolizidine core. The aza-tricyclic core is completed using an intramolecular benzoin reaction to close
Stereoselectivity in Trimethylenemethane (TMM) Diyl Mediated Cycloaddition Reaction to Angularly Fused Triquinanes
作者:Yeokwon Yoon、Taek Kang、Hee-Yoon Lee
DOI:10.1002/asia.201000672
日期:2011.2.1
the TMMdiylmediated [2+3] cycloadditionreaction of monosubstituted linear substrates to form angularlyfusedtriquinanes was carried out. Substitution at position 3 provided complete diastereoselectivity, while positions 1 and 4 induced marginal stereoselectivity. Position 2 did not show any influence on the diastereoselectivity. Position 4 turned out to be incompatible with the cycloaddition reaction