1: 99 percent / Et3N / CH2Cl2 / 0 - 20 °C 2: 30 percent Chromat. / K2CO3 / dimethylsulfoxide / 12 h / 20 °C 3: 98 percent / benzene / 6 h / Heating 4: 92 percent / methanolic ammonia / 0 - 20 °C 5: 85 percent / TMEDA; aq. HF / acetonitrile / 0 - 20 °C View Scheme

1: 87.7 percent / dimethylformamide / 4 h 2: 9.8 percent / 2,2'-azobis(2-methylpropionitrile), n-Bu3SnH / toluene / 1 h / Heating 3: 89 percent / n-Bu4NF / tetrahydrofuran View Scheme