1: 100 percent / N-methylmorpholine N-oxide (NMO), RuCl2(Ph3P)3 / dimethylformamide / 0.17 h 2: 97 percent / 6 N HCl / tetrahydrofuran / 0.5 h 3: 70 percent / p-chloranil / 2-methyl-propan-2-ol / Heating View Scheme

1: 100 percent / N-methylmorpholine N-oxide (NMO), RuCl2(Ph3P)3 / dimethylformamide / 0.17 h 2: 97 percent / 6 N HCl / tetrahydrofuran / 0.5 h 3: 70 percent / p-chloranil / 2-methyl-propan-2-ol / Heating 4: TMSOTf / tetrahydrofuran / 1 h / Ambient temperature View Scheme

1: 100 percent / N-methylmorpholine N-oxide (NMO), RuCl2(Ph3P)3 / dimethylformamide / 0.17 h 2: 97 percent / 6 N HCl / tetrahydrofuran / 0.5 h 3: 70 percent / p-chloranil / 2-methyl-propan-2-ol / Heating 4: 64 percent / TMSOTf / tetrahydrofuran / 1 h / Ambient temperature View Scheme