in dichloromethane 2 h; Ambient temperature;

in tetrahydrofuran 1 h;

sodium hydrogencarbonate; magnesium bromide in tetrahydrofuran Ambient temperatureovernight (15-24 hrs);

1: 5-bromo-2-(2,2,5,5-tetramethyl-1,2,5-azadisilolidin-1-yl)pyridine With tert.-butyl lithium in tetrahydrofuran; pentane T=-78°C; 0.166667 h; 2: With magnesium bromide diethyl etherate; zinc dibromide in tetrahydrofuran; pentane T=25°C; 0.5 h; 3: tetrahydro-2-(phenylsulphonyl)furan in tetrahydrofuran; pentane T=25°C; 20 h;