Highly Efficient, Facile, Room Temperature Intermolecular [5 + 2] Cycloadditions Catalyzed by Cationic Rhodium(I): One Step to Cycloheptenes and Their Libraries
作者:Paul A. Wender、Lauren E. Sirois、René T. Stemmler、Travis J. Williams
DOI:10.1021/ol100337m
日期:2010.4.2
A cationic rhodium(I) complex-[(C(10)H(8))Rh(cod)](+) SbF(6)(-)-Catalyzes the remarkably efficient intermolecular [5 + 2] cycloaddition of vinylcyclopropanes (VCPs) and various alkynes, providing cycloheptene cycloadducts in excellent yields in minutes at room temperature. The efficacy and selectivity of this catalyst are also shown in a novel diversification strategy, affording a cycloadduct library in one step from nine commercially available components.
A New and Practical Five-Carbon Component for Metal-Catalyzed [5 + 2] Cycloadditions: Preparative Scale Syntheses of Substituted Cycloheptenones
作者:Paul A. Wender、Alaric J. Dyckman、Craig O. Husfeld、Marc J. C. Scanio
DOI:10.1021/ol0058691
日期:2000.6.1
Described herein is an efficient preparative scale synthesis of 1-(2-methyoxyethoxy)-1-vinylcyclopropane and the investigation of the utility of this reagent as a new five-carbon component in metal-catalyzed [5 + 2] cycloadditions. A new cycloaddition procedure is also described that proceeds up to 12-fold faster and with 10-fold less catalyst than previously described, providing cycloheptenones in many cases in minutes and in isolated yields of 75-97%. The procedure is readily conducted on a small or large scale (up to 100 mmol thus far).
THE PREPARATION OF CYCLOHEPT-4-ENONES BY RHODIUM-CATALYZED INTERMOLECULAR [5+2] CYCLOADDITION
作者:Wender, Paul A.、Lesser, Adam B.、Sirois, Lauren E.
DOI:10.15227/orgsyn.088.0109
日期:——
The Transition Metal-Catalyzed Intermolecular [5+2] Cycloaddition: The Homologous Diels−Alder Reaction
作者:Paul A. Wender、Heiko Rieck、Masahiro Fuji
DOI:10.1021/ja982196x
日期:1998.10.1
Rhodium Dinaphthocyclooctatetraene Complexes: Synthesis, Characterization and Catalytic Activity in [5+2] Cycloadditions
作者:Paul A. Wender、Adam B. Lesser、Lauren E. Sirois
DOI:10.1002/anie.201108270
日期:2012.3.12
Rh COT in the act: A Ni0‐catalyzed [2+2+2+2] cycloaddition provides a high‐yielding, scalable synthesis of the ligand dinaphtho[a,e]cyclooctatetraene (dnCOT). dnCOT complexation with RhI gives [Rh(dnCOT)(MeCN)2]SbF6 (see scheme), an excellent catalyst for [5+2] cycloadditions of vinylcyclopropanes and π‐systems with impressive functional group compatibility.