1: 85 percent / p-dodecyl-SO2N3, TEA / acetonitrile 2: 72 percent / Rh2(O2CC7H15)4 / CH2Cl2 3: 72 percent / (PhO)3PCl2, HCl / pyridine; CH2Cl2; ethyl acetate; various solvent(s) 4: 1.) TEA 2.) TEA, i-BuOCOCl / 2.) DMBA / 1.) ETOH, H2O 2.) DMF View Scheme

Multi-step reaction with 2 steps 1: 88.3 percent / KOMe / methanol / 1.5 h / Ambient temperature2: 87 percent / Rh2(OAc)4 / CH2Cl2 / 0.2 h  

With  p-dodecyl-SO2N3; TEA in  acetonitrile  

Multi-step reaction with 3 steps 1: 85 percent / p-dodecyl-SO2N3, TEA / acetonitrile2: 72 percent / Rh2(O2CC7H15)4 / CH2Cl2 3: 72 percent / (PhO)3PCl2, HCl / pyridine; CH2Cl2; ethyl acetate; various solvent(s)  

Multi-step reaction with 2 steps 1: 77 percent / O3, H2O2 / CH2Cl2; methanol2: carbonyl diimidazole / tetrahydrofuran  

With  1,1'-carbonyldiimidazole in  tetrahydrofuran  

Multi-step reaction with 4 steps 1: 85 percent / p-dodecyl-SO2N3, TEA / acetonitrile2: 72 percent / Rh2(O2CC7H15)4 / CH2Cl2 3: 72 percent / (PhO)3PCl2, HCl / pyridine; CH2Cl2; ethyl acetate; various solvent(s)4: 1.) TEA 2.) TEA, i-BuOCOCl / 2.) DMBA / 1.) ETOH, H2O 2.) DMF