1: TMSCl / 72 h / 20 °C 2: TsOH / acetonitrile / 5 h / 20 °C 3: 90 percent / NaH / dimethylformamide / 3 h / 20 °C 4: 90 percent / TEA; CuI / Pd(PPh3)4 / tetrahydrofuran / 12 h / 20 °C 5: 100 percent / aq. NaOH / acetone / 3 h / 20 °C View Scheme

1: 90 percent / NaH / dimethylformamide / 3 h / 20 °C 2: 90 percent / TEA; CuI / Pd(PPh3)4 / tetrahydrofuran / 12 h / 20 °C 3: 100 percent / aq. NaOH / acetone / 3 h / 20 °C View Scheme

1: 90 percent / TEA; CuI / Pd(PPh3)4 / tetrahydrofuran / 12 h / 20 °C 2: 100 percent / aq. NaOH / acetone / 3 h / 20 °C View Scheme

1: 100 percent / aq. NaOH / acetone / 3 h / 20 °C View Scheme

Multistep reaction;

Multistep reaction;