1: 92 percent / TsOH / 20 °C 2: DMAP, Et3N / CH2Cl2 / 20 °C 3: Bu4NF / tetrahydrofuran / 20 °C 4: NaOH, H2O 5: 76 percent / cyclohexene / 5percent Pd/C / ethanol / Heating 6: 96 percent / HCl, H2O / methanol View Scheme