A singular substituent effect in the nickel(0) mediated cocyclisation of octa-1,7-diynes with alkynols. One-step synthesis of tetralin lactones from acyclic precursors
Abstract
Whereas the reaction of simple octa-1,7-diynes is fruitless, those bearing ester groups on the terminal positions react with alkynols in the presence of stoichiometric amounts of a nickel(0) reagent derived from NiCl2(PPh3)2 and BunLi to give tetralin lactones in moderate to good yields.