BINAP-AgSbF6 vs. BINAP-AgClO4 Complexes as Catalysts for the Enantioselective 1,3-Dipolar Cycloaddition of Azomethine Ylides and Alkenes
作者:José Sansano、María Martín-Rodríguez、Carmen Nájera、Paulo Costa、Evanoel de Lima、Ayres Dias
DOI:10.1055/s-0029-1219534
日期:2010.4
This work has been supported by the DGES of the Spanish Ministerio de Educacion y Ciencia (MEC) (Consolider INGENIO 2010 CSD2007-00006, CTQ2007-62771/BQU, the Hispano-Brazilian project PHB2008-0037-PC and CNPq-2878), Generalitat Valenciana (PROMETEO/2009/039), and by the University of Alicante.
这项工作得到了西班牙教育部长 y Ciencia (MEC) DGES 的支持 (Consolider INGENIO 2010 CSD2007-00006, CTQ2007-62771/BQU, the Hispano-Brazilian project PHB2008-0037-PC and CNPq)-General瓦伦西亚纳 (PROMETEO/2009/039) 和阿利坎特大学。
Corrigendum to ‘‘Binap-gold(I) trifluoroacetate as a bifunctional catalyst for the synthesis of chiral prolines through 1,3-dipolar cycloaddition of azomethine ylides” [Tetrahedron: Asymmetry 21 (2010) 1184–1186]
作者:Carmen Nájera、María Martín-Rodríguez、Feng-Liu Wu、José M. Sansano
DOI:10.1016/j.tetasy.2010.10.005
日期:2010.10
Binap-gold(I) trifluoroacetate as a bifunctional catalyst for the synthesis of chiral prolines through 1,3-dipolar cycloaddition of azomethine ylides
作者:María Martín-Rodríguez、Carmen Nájera、José M. Sansano、Feng-Liu Wu
DOI:10.1016/j.tetasy.2010.06.011
日期:2010.5
Highly enantioselective 1,3-dipolar cycloadditions of amino acid-derived azomethine ylides with alkenes have been performed, for the first time, under gold-catalysis using (S-a)- or (R-a)-Binap-gold(I) trifluoroacetate complexes, with the cationic Binap-gold acting as a Lewis acid and the counteranion as a base. Maleimides and trans-1,2-bis(phenylsulfonyl)ethylene were reacted with imino esters at room temperature in the absence of a base to afford, in very good yields, the corresponding polysubstituted prolines with total endo-diastereoselection and higher enantioselectivities than the Binap-silver trifluoroacetate complex. (C) 2010 Elsevier Ltd. All rights reserved.
Binap-Gold(I) versus Binap-Silver Trifluoroacetate Complexes as Catalysts in 1,3-Dipolar Cycloadditions of Azomethine Ylides
作者:María Martín-Rodríguez、Carmen Nájera、José M. Sansano、Abel de Cózar、Fernando P. Cossío
DOI:10.1002/chem.201101606
日期:2011.12.9
The 1,3‐dipolarcycloaddition between azomethine ylides and alkenes is efficiently catalysed by [(Sa)‐Binap‐Au(tfa)}2] (Binap=2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl; tfa=trifluoroacetyl). Maleimides, 1,2‐bis(phenylsulfonyl)ethylene, chalcone and nitrostyrene were suitable dipolarophiles even when using sterically hindered 1,3‐dipole precursors. The results obtained in these transformations improve
Binap-silver salts as chiral catalysts for the enantioselective 1,3-dipolar cycloaddition of azomethine ylides and alkenes
作者:Juan Mancebo-Aracil、María Martín-Rodríguez、Carmen Nájera、José M. Sansano、Paulo R.R. Costa、Evanoel Crizanto de Lima、Ayres G. Dias
DOI:10.1016/j.tetasy.2012.10.015
日期:2012.12
Binap-AgSbF6 catalyzed 1,3-dipolarcycloadditions between azomethineylides and electrophilicalkenes are described and compared with analogous transformations mediated by other Binap-silver(I) salt complexes. Maleimides and 1,2-bis(phenylsulfonyl)ethylene are suitable dipolarophiles for obtaining very good enantioselectivities, even better values are generated by a multicomponent version. There are