1: 82 percent / SO3*pyridine, Et3N, DMSO / CH2Cl2 / 2 h / Ambient temperature 2: 1.) sodium tert-amylate / 1.) benzene, reflux, 2.) benzene, reflux to RT 3: Pd(OAc)2, triisopropylphosphite / tetrahydrofuran / 2 h / Ambient temperature View Scheme