1: 91 percent / NaBH(OAc)3 / 1,2-dichloro-ethane / 1 h / 20 °C 2: N-tert-butylphenylsulfinimidoyl chloride; DBU / CH2Cl2 / 0.5 h / -78 °C 3: citric acid; water / 1 h / 20 °C View Scheme

T=180°C;