Gold-Catalyzed [4C+2C] Cycloadditions of Allenedienes, including an Enantioselective Version with New Phosphoramidite-Based Catalysts: Mechanistic Aspects of the Divergence between [4C+3C] and [4C+2C] Pathways
作者:Isaac Alonso、Beatriz Trillo、Fernando López、Sergi Montserrat、Gregori Ujaque、Luis Castedo、Agustí Lledós、Jose L. Mascareñas
DOI:10.1021/ja905415r
日期:2009.9.16
Gold(I) complexes featuring electron acceptor ligands such as phosphites and phosphoramidites catalyze the [4C+2C] intramolecular cycloaddition of allenedienes. The reaction is chemo- and stereoselective, and provides trans-fused bicyclic cycloadducts in good yields. Moreover, using novel chiral phosphoramidite-based gold catalysts it is possible to perform the reaction with excellent enantioselectivity
Mauleon, Pablo; Zeldin, Rachel M.; Gonzalez, Ana Z., Journal of the American Chemical Society, 2009, vol. 131, p. 6348 - 6349
作者:Mauleon, Pablo、Zeldin, Rachel M.、Gonzalez, Ana Z.、Toste, F. Dean
DOI:——
日期:——
Ruthenium-Catalyzed (2 + 2) Intramolecular Cycloaddition of Allenenes
作者:Moisés Gulías、Alba Collado、Beatriz Trillo、Fernando López、Enrique Oñate、Miguel A. Esteruelas、José L. Mascareñas
DOI:10.1021/ja200784n
日期:2011.5.25
We report a ruthenium-catalyzed (2 + 2) intramolecularcycloaddition of allenes and alkenes. We have found that the use of the ruthenium complex RuH(2)Cl(2)(P(i)Pr(3))(2), which has previously gone unnoticed in catalytic applications, is crucial for the observed reactivity. The reaction proceeds under mild conditions and is fully diastereoselective, providing a practical entry to a variety of bicyclo[3
Gold(I)-Catalyzed Enantioselective [4 + 2]-Cycloaddition of Allene-dienes
作者:Ana Z. González、F. Dean Toste
DOI:10.1021/ol902622b
日期:2010.1.1
An enantioselective gold(I)-catalyzed intramolecular [4 + 2]-cycloaddition of allenes and dienes is reported. The reactions allow for the asymmetric synthesis of trans-hexahydroindenes and pyrrolidine products using C3-symmetric phosphitegold(I) and ortho-arylphosphoramiditegold(I) complexes as catalysts, respectively.