1: DMSO, (COCl)2, Et3N / CH2Cl2 2: 28 percent / (Ph3P)3RhCl / acetonitrile / 160 °C 3: DDQ / CH2Cl2; H2O 4: DMSO, (COCl)2 / CH2Cl2 5: TsOH / benzene 6: H2 / Pd-C / ethyl acetate 7: CrO3, H2SO4 / acetone 8: 2N-HCl / tetrahydrofuran / Ambient temperature 9: (C6H11)2NMgBr / methanol / -55 °C 10: DDQ / CH2Cl2 / 1.5 h / Ambient temperature; buffer (pH 6.86) View Scheme