1: K2CO3 2: PBr3 View Scheme

1: tert-butyldimethylsilanol With sodium hydride in tetrahydrofuran 0.5 h; 2: C12H18BrNO3Si T=20°C; 2 h; 3: With hydrogenchloride; ammonium chloride more than 3 stages;

hydrogenchloride 48 h; Heating;

water Heating;