1: 93 percent 2: 76 percent / Li / liquid ammonia View Scheme

1: 93 percent 2: 76 percent / Li / liquid ammonia 4: 1.) LDA, phenylselenyl bromide; 2.) 30percent H2O2 / 2.) CH2Cl2/pyridine, O degC to RT 5: 44 percent / DiBAH / toluene / 4 h / -78 °C View Scheme