1.1: 83 percent / N,N-dimethylaniline 2.1: O3 / methanol; CH2Cl2 / -78 °C 2.2: Ac2O; Et3N; DMAP / -78 - 20 °C 2.3: 89 percent / LiAlH4 / tetrahydrofuran / 0 - 20 °C 3.1: 87 percent / p-toluenesulfonic acid / nitromethane / 3 h / 20 °C View Scheme