1: 94.7 percent / acetonitrile 2: DMSO, NaH / tetrahydrofuran / 0.5 h View Scheme

1: 1.) n-butyllithium, HMPT / 1.) THF, n-hexane, -15 deg C, 3 h 2.) -15 deg C - r.t., 19 h; yield 82 percent 2: 91 percent / p-toluenesulfonic acid monohydrate / methanol / 2 h / Ambient temperature 3: 87 percent / lithium tetrahydridoaluminate / bis-(2-methoxy-ethyl) ether / 66 h / 140 °C View Scheme

sodium hydride; dimethyl sulfoxide in tetrahydrofuran 0.5 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

pyridine; dibromotriphenyl-phosphorane in acetonitrile T=0 - 25°C; 2.33333 h;