New Initiation Modes for Directed Carbonylative C–C Bond Activation: Rhodium-Catalyzed (3 + 1 + 2) Cycloadditions of Aminomethylcyclopropanes
作者:Gang-Wei Wang、Niall G. McCreanor、Megan H. Shaw、William G. Whittingham、John F. Bower
DOI:10.1021/jacs.6b08608
日期:2016.10.19
Under carbonylative conditions, neutral Rh(I)-systems modified with weak donorligands (AsPh3 or 1,4-oxathiane) undergo N-Cbz, N-benzoyl, or N-Ts directed insertion into the proximal C–C bond of aminomethylcyclopropanes to generate rhodacyclopentanone intermediates. These are trapped by N-tethered alkenes to provide complex perhydroisoindoles.
Rh(I)-Catalyzed Intramolecular [3 + 2] Cycloaddition of <i>trans</i>-Vinylcyclopropane-enes
作者:Lei Jiao、Siyu Ye、Zhi-Xiang Yu
DOI:10.1021/ja8008715
日期:2008.6.1
Vinylcyclopropane (VCP) has been well applied as a five-carbon component, rather than a three-carbon component, in transition-metal catalyzed cycloadditions. Here we demonstrate a Rh(I)-catalyzed [3 + 2] reaction of trans-VCP-enes, where VCP acts as a three-carbon synthon to furnish five-membered carbocycles. This novel cycloaddition is efficient in generating bicyclic cyclopentanes in good yields
Synthesis of Bridged Cyclopentane Derivatives by Catalytic Decarbonylative Cycloaddition of Cyclobutanones and Olefins
作者:Xuan Zhou、Haye Min Ko、Guangbin Dong
DOI:10.1002/anie.201608158
日期:2016.10.24
decarbonylative coupling between cyclobutanones and alkenes that proceeds by C−C activation and provides a distinct approach to a diverse range of saturated bridged cyclopentane derivatives. In this reaction, cyclobutanones serve as cyclopropane surrogates, reacting in a formal (4+2−1) transformation. To demonstrate the efficacy of this method, it was applied in a concise synthesis of the antifungal drug Tolciclate