An efficient access to novel trifluoromethyl-substituted phosphonate analogues of 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid (TIC) derivatives based on regioselective ruthenium-catalyzed co-cyclotrimerization of functionalized 1,7-diynes with various alkynes has been developed using RuClCp*cod and preferably Grubbs second-generation catalysts.
Key words
α-aminophosphonates - 1,7-azadiynes - alkynes - cyclotrimerization - ruthenium catalysis