Herein, a RhIII‐catalyzed stereocontrolled synthesis of benzo[k]fluoranthenes is reported. It was found that the unexpected E/Z isomerization was highly sensitive to the electronic effects of the substituents on the aryl groups. Theoretical calculations revealed that this controllable stereochemistry originates from the mediation of rhodacyclopentadiene intermediates during the isomerization. The fact
本文报道了Rh III催化的苯并[ k ]氟蒽的立体控制合成。发现意外的E / Z异构化对芳基上的取代基的电子效应高度敏感。理论计算表明,这种可控的立体化学源自异构化过程中若丹环戊二烯中间体的介导。使用Ir III催化剂时观察到相似的立体化学的事实进一步表明,这一发现对某些其他过渡金属具有一定的普遍性。
Formal [(2+2)+2] and [(2+2)+(2+2)] Nonconjugated Dienediyne Cascade Cycloadditions
作者:Yao-Ting Wu、Anthony Linden、Jay S. Siegel
DOI:10.1021/ol0514799
日期:2005.9.1
graph Fluoranthene 2 and heptacycle 3 are easily accessible from the reaction of diyne 1 and norbornadiene (NBD) in the presence of the rhodium catalyst. The unusual [(2+2)+(2+2)] adduct 3 was confirmed by the X-ray crystal structure analysis.
Synthesis of Fluoranthenes and Indenocorannulenes: Elucidation of Chiral Stereoisomers on the Basis of Static Molecular Bowls
作者:Yao-Ting Wu、Tomoharu Hayama、Kim K. Baldridge、Anthony Linden、Jay S. Siegel
DOI:10.1021/ja058391a
日期:2006.5.1
aromatics. Fluoranthenes 9 (or 13) are easily accessible in good to excellent yields (75-99%; 18 examples) from the reaction of symmetric (or asymmetric) diynes 4 and alkynes 5 (or norbornadiene) in the presence of Wilkinson's catalyst. This formal [(2+2)+2] cycloaddition can also be applied to generate various indenocorannulenes 28 from 2,3-diethynylcorannulene derivatives 27 and alkynes 5. The indenocorannulenes