1: LDA / tetrahydrofuran; hexane / 0.5 h / -78 °C 2: tetrahydrofuran; hexane / 2 h / -78 - 0 °C 3: 1.) 6 N HCl, 2.) Dowex 50 WX / 1.) water, 175 deg C to 185 deg C, 4 h; 2.) water View Scheme

1: LDA / tetrahydrofuran; hexane / 0.5 h / -78 °C 2: tetrahydrofuran; hexane / 2 h / -78 - 0 °C 3: 1.) 6 N HCl, 2.) Dowex 50 WX / 1.) water, 175 deg C to 185 deg C, 4 h; 2.) water View Scheme

1: LDA / tetrahydrofuran; hexane / 0.5 h / -78 °C 2: tetrahydrofuran; hexane / 2 h / -78 - 0 °C 3: 1.) 6 N HCl, 2.) Dowex 50 WX / 1.) water, 175 deg C to 185 deg C, 4 h; 2.) water View Scheme

1: LDA / tetrahydrofuran; hexane / 0.5 h / -78 °C 2: tetrahydrofuran; hexane / 2 h / -78 - 0 °C 3: 1.) 6 N HCl, 2.) Dowex 50 WX / 1.) water, 175 deg C to 185 deg C, 4 h; 2.) water View Scheme