1: 2,3-difluoropyridine With n-butyllithium; diisopropylamine in tetrahydrofuran; hexanes T=-78°C; 1.25 h; 2: tri-isopropoxy-borane in tetrahydrofuran; hexanes T=-78°C; 1 h;

1: With n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78°C; 1 h; 2: With tri-isopropoxy-borane in tetrahydrofuran; hexane T=-78°C; 1 h;