1: N,N-diisopropylethylamine / CH2Cl2 / 0.25 h / 0 °C 2: 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / CH2Cl2; H2O / 0.5 h / Ambient temperature 3: 1.) 2,4,6-trichlorobenzoyl chloride, Et3N, 2.) 4-dimethylaminopyridine / 1.) toluene, room temperature, 2 h, 2.) toluene, overnight. 4: 31 percent / AgNO3, phosphate buffer, N-chlorosuccinimide / acetone / 0.17 h / Ambient temperature; pH=7 6: 80 percent / pyridinium poly(hydrogen fluoride) / tetrahydrofuran / 0 °C View Scheme