A [2+2+2]-Cyclotrimerization Approach to Selectively Substituted Fluorenes and Fluorenols, and Their Conversion to 9,9′-Spirobifluorenes
作者:Reinhard P. Kaiser、Filip Hessler、Jiří Mosinger、Ivana Císařová、Martin Kotora
DOI:10.1002/chem.201502370
日期:2015.9.21
Synthesis of selectivelysubstitutedfluorenes and fluorenols was achieved by using catalytic [2+2+2]cyclotrimerization. Various starting diynes were reacted with different alkynes in the presence of a catalytic amount of Wilkinson’s catalyst (RhCl(PPh3)3) providing the compounds possessing the fluorene scaffold in good isolated yields. A set of four regioselectively substitutedfluorenols was converted