1: 1. MCPBA 2) 1N HCl / 1) CH2Cl2, 4 hr, 20 deg C 2) 100 deg C, 1.5 hr 2: 1) Te, NaBH4 2) 1N NaOH / 1) EtOH, reflux 2) -> pH ca. 12, EtOH 3) THF, reflux, ca. 2 hr View Scheme

1: 92 percent / m-chloroperbenzoic acid / CH2Cl2 / 0 °C 2: 22 °C 3: K2CO3 / acetonitrile / 22 °C View Scheme

sodium ditelluride in ethanol Heating;