Medium sized trans-cycloalkenes are unusually reactive in the intermolecular Pauson-Khand reaction (PKR) with regard to typical monocyclic alkenes. This is due to the ring strain imparted by the E stereochemistry. The PKR of these alkenes offers a modular, regioselective and straightforward entry to trans fused [n.3.0] bicyclic scaffolds (n = 6-8).
Reaction of Methylidenecycloalkanes with BF3·THF Catalyzed by Cp2TiCl2
作者:L. I. Tulyabaeva、R. R. Salakhutdinov、A. R. Tulyabaev、T. V. Tyumkina、M. F. Abdullin
DOI:10.1134/s1070428022120296
日期:2022.12
Abstract The reaction of methylidenecycloalkanes with BF3·THF in the presence of Cp2TiCl2 as catalyst has been performed for the first time to obtain 1-fluoroboriranes spiro-fused to cycloalkanes and 1-methylcycloalk-1-enes formed as a result of isomerization of the initial olefin. The product structure was confirmed by one- (1H, 13C DEPT, 11B, 19F) and two-dimensional (COSY, HSQC, HMBC) NMR and mass
Cp2TiCl2-Catalyzed Reaction of Methylidenecycloalkanes with BF3·THF
作者:L. I. Tulyabaeva、R. R. Salakhutdinov、A. R. Tulyabaev、T. V. Tyumkina、M. F. Abdullin
DOI:10.1134/s1070428023090063
日期:2023.9
Abstract The Cp2TiCl2-catalyzed reaction of methylidenecycloalkanes with BF3·THF in tetrahydrofuran with the formation of 1-fluoro-1-boraspirocarbocycles and isomerization products of the initial monomer (1-methylcycloalk-1-enes) has been reported for the first time. The product structure was confirmed by one- (1H, 13C DEPT, 11B, 19F) and two-dimensional (COSY, HSQC, HMBC) NMR spectroscopy and mass