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
Stereoselective Nickel-Catalyzed [2+2] Cycloadditions of Ene-Allenes
作者:Njamkou N. Noucti、Erik J. Alexanian
DOI:10.1002/anie.201411737
日期:2015.4.27
A stereoselective nickel‐catalyzed [2+2] cycloaddition of ene‐allenes is reported. This transformation encompasses a broad range of ene‐allene substrates, thus providing efficient access to fused cyclobutanes from easily accessed π‐components. A simple and inexpensive first‐row catalyticsystem comprised of [Ni(cod)2] and dppf was used in this process, thus constituting an attractive approach to synthetically