1: H2 / Pd/C / ethyl acetate / 2 h / 20 °C 2: Et3N / tetrahydrofuran / 3 h / 0 °C 3: TBAF / tetrahydrofuran / 3 h / 0 °C 4: Et3N, DMAP / CH2Cl2 / 3 h / 20 °C 5: H2 / Pd/C / methanol; ethyl acetate 6: 66 percent / HOBT, 1-(3-dimethylaminopropyl)-ethylcarbodiimide*HCl / CH2Cl2; dimethylformamide / 10 h / 0 to 20 deg C 7: 54 percent / TBAF / tetrahydrofuran / 1.5 h / 20 °C View Scheme