通过分子内串联断裂-环化反应,通过光化学诱导的电子转移(PET)三环α-环丙基酮在羰基的γ位具有不饱和侧链,合成了稠合的三环角化合物。该反应导致β-环丙基键的区域选择性裂解,并通过酮基自由基/自由基阴离子作为反应性中间体形成有角稠合的三环系统。通常,三乙胺(TEA)在乙腈中用作强还原剂。环化步骤的首选区域选择性(外向与内向)取决于在三环α-环丙基酮的季碳中心(Cβ')处的取代模式。此外,我们还检查了有角二恶英-三喹烷的合成的两步途径,包括烯丙氧基取代的环戊[ c ]呋喃酮衍生物的光解以及随后的二恶唑-[4.5.5.5] fenestrane在还原条件下的β裂解。 PET条件。
Isodicyclopentadienes and related molecules. Part 41. Stereochemical course of Diels-Alder cycloadditions to (hydroxymethyl)-substituted plane-nonsymmetric cyclopentadienes
作者:Leo A. Paquette、Corinne Vanucci、Robin D. Rogers
DOI:10.1021/ja00197a045
日期:1989.7
Etude des facteurs steriques, electroniques et des liaisons hydrogenes potentielles, gouvernant la stereoselectivite dans l'addition de Diels Alder d'hydroxymethylcyclopentadienes
Etude des facteurs steriques,electroniques et des liaisons Hydrogens potentielles, gouvernant lastereoselectivite dans l'addition de Diels Alder d'hydroxymethylcyclopentadienes
Fenestranes in Recent Synthetic Developments
作者:M. Thommen、Reinhart Keese
DOI:10.1055/s-1997-755
日期:1997.3
The systematic description of planarizing distortions of tetracoordinate carbon is outlined and specifically discussed for C(C)4 moieties which form the central part of fenestranes. Recent synthetic developments of the preparation of stereoisomeric [4.5.5.5]fenestranes and [5.5.5.5]fenestranes are described. Transformations with the aim of increased planarizing distortions are presented. The interaction of Fe2(CO)9 with a fenestradiene led to three structurally well defined Fe-carbonyl complexes.
Bicyclo[3.3.0]octanone and bicyclo[4.3.0]nonanone derivatives with a cyclopropane unit in the alpha-position and an unsaturated side chain in the gamma-position of the carbonyl group undergo fragmentation-cyclization processes leading to quasi-triquinane systems upon reductive photoinduced electron transfer (PET). For example, the new angular triquinane derivative 6 and the new propellane derivative 12 were synthesized in one step from these starting materials in moderate to good yields. (C) 2003 Elsevier Ltd. All rights reserved.
Synthesis of angularly fused cyclopentanoids and analogous tricycles via photoinduced ketyl radical/radical anion fragmentation–cyclization reactions
作者:Nikolay T. Tzvetkov、Torsten Arndt、Jochen Mattay
DOI:10.1016/j.tet.2007.07.092
日期:2007.10
Angular fused tricycles were synthesized through intramolecular tandem fragmentation–cyclizationreactions by photochemically induced electron transfer (PET) of tricyclic α-cyclopropyl ketones with an unsaturated side chain at the position γ to the carbonyl group. The reactions resulted in regioselective cleavage of a β-cyclopropyl bond with formation of angular fused tricyclic ring systems via ketyl
通过分子内串联断裂-环化反应,通过光化学诱导的电子转移(PET)三环α-环丙基酮在羰基的γ位具有不饱和侧链,合成了稠合的三环角化合物。该反应导致β-环丙基键的区域选择性裂解,并通过酮基自由基/自由基阴离子作为反应性中间体形成有角稠合的三环系统。通常,三乙胺(TEA)在乙腈中用作强还原剂。环化步骤的首选区域选择性(外向与内向)取决于在三环α-环丙基酮的季碳中心(Cβ')处的取代模式。此外,我们还检查了有角二恶英-三喹烷的合成的两步途径,包括烯丙氧基取代的环戊[ c ]呋喃酮衍生物的光解以及随后的二恶唑-[4.5.5.5] fenestrane在还原条件下的β裂解。 PET条件。