3 A molecular sieve; trifluoroacetic acid in dichloromethane 0.333333 h; Ambient temperature;

Multi-step reaction with 7 steps 1: DMSO, (COCl)2 / CH2Cl2 2: TsOH / benzene3: H2 / Pd-C / ethyl acetate4: CrO3, H2SO4 / acetone5: 2N-HCl / tetrahydrofuran / Ambient temperature6: (C6H11)2NMgBr / methanol / -55 °C7: DDQ / CH2Cl2 / 1.5 h / Ambient temperature; buffer (pH 6.86)