PPA; silica gel in dichloromethane 24 h; Heating;

sodium hydride in ethylene glycol dimethyl ether 15 h; Heating; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

1: NaH / 1,2-dimethoxy-ethane / 15 h / Heating 2: 100 percent / polyphosphoric acid, silica gel / CH2Cl2 / 24 h / Heating View Scheme

hydrogenchloride; tert.-butyl lithium 1.) Et2O, pentane, -78 deg C, 90 min; 2.) Et2O, pentane, -15 deg C, 75 min; 3.) Et2O, pentane, r.t., 30 min; Yield given. Multistep reaction;