Reaction of Allylsilanes and Allylstannanes with Alkynes Catalyzed by Electrophilic Late Transition Metal Chlorides
作者:Carolina Fernández-Rivas、María Méndez、Cristina Nieto-Oberhuber、Antonio M. Echavarren
DOI:10.1021/jo025812n
日期:2002.7.1
The intramolecular reaction of allylsilanes and allylstannanes with alkynes proceeds catalytically in the presence of Pt(II), Pd(II), Ru(II), and Au(III) chlorides. Although more limited, AgOTf also catalyzes the cyclization. Usually, PtCl2 as the catalyst in methanol or acetone gives the best results. The reaction proceeds by exo attack of the allyl nucleophile on the alkyne to form five- or six-membered
Following an ISES Lead: The First Examples of Asymmetric Ni(0)-Mediated Allylic Amination
作者:David B. Berkowitz、Gourhari Maiti
DOI:10.1021/ol049159x
日期:2004.8.1
phosphines could promote Ni(0)-mediated allylic amination. Therefore, bidentate phosphines bearing central, axial, and planar chirality were examined with two model substrates of interest for PLP-enzyme inhibitor synthesis. In the best case, with (R)-MeO-BIPHEP, vinylglycinol derivative 2 was obtained in 75% ee (97% ee, one recrystallization) from 1. Further manipulation provided a Ni(0)-mediated entry into
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>: A New Class of Strong and Bulky Lewis Acid for <i>Exo</i>-Selective Intermolecular Diels–Alder Reactions of Unreactive Acyclic Dienes with α,β-Enals
Lewisacid B(C6F5)3 catalyzed the Diels–Alderreactions of multisubstituted open-chain dienes and α,β-enals to afford the desired products with high exo-selectivities are reported. The substituent effect of the dienes and dienophiles on the product’s stereoselectivity was thoroughly investigated, and it was found that most of the desired exo-Diels–Alder products could be obtained in good yields and
据报道,路易斯酸B(C 6 F 5)3催化多取代的开链二烯和α,β-烯醛的Diels-Alder反应,可提供所需的具有高外选择性的产物。彻底研究了二烯和亲二烯体对产物立体选择性的取代作用,发现大多数所需的exo -Diels-Alder产品可以高收率和高exo-立体选择性获得。
Metal-Catalyzed Carbocyclization by Intramolecular Reaction of Allylsilanes and Allylstannanes with Alkynes
作者:Carolina Fernández-Rivas、María Méndez、Antonio M. Echavarren
DOI:10.1021/ja993524b
日期:2000.2.1
Palladium-catalyzed [3+2] cycloaddition of 60-fullerene with cis-HOCH2CHCHCH2OCO2Et