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.