1: 99 percent / 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride; 4-dimethylaminopyridine / CH2Cl2 / 0 - 20 °C 2: 95 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 5 h / 20 °C 3: 6.14 g / DMAP / toluene / 1 h 4: 85 percent / tetra-n-butylammonium fluoride; acetic acid / tetrahydrofuran / 120 h / 20 °C 5: 95 percent / N,N-diisopropylethylamine / CH2Cl2 / 0 - 20 °C 6: 65 percent / Cl2Ru(=CHC6H5)(PCy3)(1,3-Mes2-imidazolidin-2-yl) / 1,2-dichloro-ethane / 120 h / 80 °C 7: 99 percent / DDQ / CH2Cl2; H2O / 0.5 h / 20 °C 8: 90 percent / trifluoroacetic acid / CH2Cl2 / 0 - 20 °C View Scheme