iodine; triethylamine; triphenylphosphine in dichloromethane 24 h;

[bis(acetoxy)iodo]benzene; sodium acetate in methanol T=20°C; oxidative cyclization; 1 h;

1: benzotriazol-1-ol; O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate; triethylamine / ethyl acetate / 24 h / Inert atmosphere 2: iodine; triethylamine; triphenylphosphine / dichloromethane / 24 h / Inert atmosphere View Scheme

1: triethylamine; magnesium sulfate / 20 °C 2: 84 percent / (diacetoxyiodo)benzene; NaOAc / methanol / 1 h / 20 °C View Scheme

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