1.1: methanol / 12 h / 20 °C / Molecular sieve 1.2: 0.5 h / Cooling with ice 2.1: triethylamine / dichloromethane / 0 - 20 °C 3.1: acetonitrile / 0.25 h / 20 °C 4.1: didodecanoyl peroxide / 1,2-dichloro-ethane / Reflux 5.1: trifluoroacetic acid / 48 h / Reflux View Scheme