1: 2.) NaI / 1.) mesylation 2.) M2CO, reflux 2: Amberlyst A-26 polymer-supported nitrite reagent / benzene / 8 h / Ambient temperature 3: CH2Cl2 / 2 h / -78 gradC to 0 gradC View Scheme

in dichloromethane 2 h; -78 gradC to 0 gradC;