1.1: TBAF / tetrahydrofuran / 5 h / 40 - 50 °C 1.2: 62 percent / benzene; CHCl3 / Heating 2.1: 65 percent / MgBr2*OEt2 / benzene; diethyl ether / 11 h / 0 - 20 °C View Scheme

1.1: TBAF / tetrahydrofuran / 5 h / 40 - 50 °C 1.2: 62 percent / benzene; CHCl3 / Heating 2.1: 47 percent / LDA; Py*HCl / tetrahydrofuran / -78 - 20 °C 3.1: 81 percent / MgBr2*Et2O; EtSH / diethyl ether; benzene / 11 h / 0 - 20 °C View Scheme