1.1: 49 percent / diethyl azodicarboxylate; PPh3 / CH2Cl2 / 20 °C 2.1: H2 / Pd/C / tetrahydrofuran; methanol 3.1: aniline; NaNO2; NaOAc / aq. HCl; methanol; tetrahydrofuran 3.2: Na2S2O4; NaOAc / ethanol; H2O; tetrahydrofuran 4.1: 85 percent / HATU; 4-methylmorpholine / dimethylformamide View Scheme