(tBuCN)2CuOTf; 1-Fluoro-2,4,6-trimethylpyridinium trifluoromethanesulfonate in ethyl acetate T=25°C; 12 h; Inert atmosphereGlovebox;

aluminium trichloride in dichloromethane T=-78°C; 4 h;

in tetrahydrofuran byproducts: 1-naphthylboronic acid; to srirred soln. of Sn-compound in THF was added soln. of BH3 in THF under N2, mixt. was left at room temp. for 1 h, refluxed for 3 h, cooled, Et2O and water was added; dried with MgSO4, solvent was removed under vac., column chromy. on silica gel with hexane and hexane-Et2O, recrystd. from water;

borane; water in tetrahydrofuran 4 h; Heating;

in dichloromethane 24 h; Heating;