1: 81 percent / O3 / methanol / 0.67 h / -20 °C 2: 86 percent / methanol; tetrahydrofuran; H2O / 17 h / Ambient temperature 3: 1.) NaBH4, 2.) methacryloyl chloride / 1.) DMF, -20 deg C, 2.5 h, 2.) DMF, 0 deg C, 3 h View Scheme