1.1: 50 percent / NaNO2; aq. KH2PO4; H3PO4 / CH2Cl2 / 48 h / 23 °C 2.1: 93 percent / EDC*HCl; DMAP; DIPEA / CH2Cl2 3.1: 95 percent / NaH / tetrahydrofuran 4.1: 87 percent / Bu3SnH; AcOH / (Ph3P)2PdCl2 / CH2Cl2 5.1: 86 percent / (PhSeO)2O / CH2Cl2 6.1: DMSO; Tf2O / CH2Cl2 6.2: DIPEA; t-BuOH; tert-butyl-tetramethylguanidine / CH2Cl2 6.3: 55 percent / CH2Cl2 7.1: 85 percent / p-TsOH / CHCl3 8.1: 55 percent / N-methylpyridinium-4-carboxaldehyde iodide; DBU; oxalic acid 9.1: 91 percent / silica gel / ethanol 10.1: 88 percent / AgNO3 / acetonitrile; H2O View Scheme