1.1: LDA / tetrahydrofuran; hexane / -78 - 20 °C 1.2: 57 percent / tetrahydrofuran; hexane / 6 h / 20 °C / Irradiation 2.1: BBr3 View Scheme

1: With lithium diisopropyl amide in tetrahydrofuran; hexane T=-78 - 20°C; 2: in tetrahydrofuran; hexane T=20°C; 6 h; Irradiation;