sodium hydroxide in diethyl ether 0 deg C, 1 h, then r.t., 1.5 h;

sodium hydride in tetrahydrofuran 1 h; Heating;

1: 1) NaH / 1) oil, THF, 0 deg C, 2) THF, 2 h, reflux 2: 69 percent / a) bromine, triphenylphosphine, b) Et3N / CH2Cl2 / a) 0.5 h, r.t., b) 12 h, r.t. View Scheme