1: 99 percent / pyridine / 40 h / 6 °C 2: chloramine-T / tetrahydrofuran / 1 h 3: 2,6-di-tert-butylpyridine, NaI / acetone / 17.5 h / 54 °C 4: 1.) LDA / 1.) DME, -78 deg C, 12 min, 2.) -78 deg C, 2 h 5: 1.) LDA / 1.) DME, -78 deg C, 10 min, 2.) -78 deg C -> 0 deg C, 25 min 6: 1.) m-CPBA, 2.) pyridine, 3.) Me2S, 4.) PhSH, NEt3 7: 88 percent / AcOH / tetrahydrofuran; H2O / 7 h / 21 °C View Scheme