1: 85 percent / diethyl ether / 7 h / 22 - 24 °C 2: 97 percent / PPTs / CH2Cl2 / 1 h / 22 - 24 °C 3: 80 percent / Bu4NF / tetrahydrofuran / 2 h / 22 - 24 °C 4: 1) (COCl)2, DMSO, 2) Et3N / 1) CH2Cl2, -60 deg C, 2) -60 to 24 deg C 5: 95 percent / tetrahydrofuran / 1) -78 deg C, 1 h, 2) up to 22-24 deg C 6: 94 percent / PPTS / ethanol / 1 h / Heating 7: 1) (COCl)2, DMSO, 2) Et3N / 1) CH2Cl2, -60 deg C, 2) -60 to 24 deg C 8: 92 percent / bis(triphenyltin) sulfide, boron trichloride / toluene / 2 h / Heating View Scheme

1: 95 percent / tetrahydrofuran / 1) -78 deg C, 1 h, 2) up to 22-24 deg C 2: 94 percent / PPTS / ethanol / 1 h / Heating 3: 1) (COCl)2, DMSO, 2) Et3N / 1) CH2Cl2, -60 deg C, 2) -60 to 24 deg C 4: 92 percent / bis(triphenyltin) sulfide, boron trichloride / toluene / 2 h / Heating View Scheme

1: 1) (COCl)2, DMSO, 2) Et3N / 1) CH2Cl2, -60 deg C, 2) -60 to 24 deg C 2: 95 percent / tetrahydrofuran / 1) -78 deg C, 1 h, 2) up to 22-24 deg C 3: 94 percent / PPTS / ethanol / 1 h / Heating 4: 1) (COCl)2, DMSO, 2) Et3N / 1) CH2Cl2, -60 deg C, 2) -60 to 24 deg C 5: 92 percent / bis(triphenyltin) sulfide, boron trichloride / toluene / 2 h / Heating View Scheme

1: 1) (COCl)2, DMSO, 2) Et3N / 1) CH2Cl2, -60 deg C, 2) -60 to 24 deg C 2: 92 percent / bis(triphenyltin) sulfide, boron trichloride / toluene / 2 h / Heating View Scheme

1: 94 percent / PPTS / ethanol / 1 h / Heating 2: 1) (COCl)2, DMSO, 2) Et3N / 1) CH2Cl2, -60 deg C, 2) -60 to 24 deg C 3: 92 percent / bis(triphenyltin) sulfide, boron trichloride / toluene / 2 h / Heating View Scheme

1: 97 percent / PPTs / CH2Cl2 / 1 h / 22 - 24 °C 2: 80 percent / Bu4NF / tetrahydrofuran / 2 h / 22 - 24 °C 3: 1) (COCl)2, DMSO, 2) Et3N / 1) CH2Cl2, -60 deg C, 2) -60 to 24 deg C 4: 95 percent / tetrahydrofuran / 1) -78 deg C, 1 h, 2) up to 22-24 deg C 5: 94 percent / PPTS / ethanol / 1 h / Heating 6: 1) (COCl)2, DMSO, 2) Et3N / 1) CH2Cl2, -60 deg C, 2) -60 to 24 deg C 7: 92 percent / bis(triphenyltin) sulfide, boron trichloride / toluene / 2 h / Heating View Scheme

1: 80 percent / Bu4NF / tetrahydrofuran / 2 h / 22 - 24 °C 2: 1) (COCl)2, DMSO, 2) Et3N / 1) CH2Cl2, -60 deg C, 2) -60 to 24 deg C 3: 95 percent / tetrahydrofuran / 1) -78 deg C, 1 h, 2) up to 22-24 deg C 4: 94 percent / PPTS / ethanol / 1 h / Heating 5: 1) (COCl)2, DMSO, 2) Et3N / 1) CH2Cl2, -60 deg C, 2) -60 to 24 deg C 6: 92 percent / bis(triphenyltin) sulfide, boron trichloride / toluene / 2 h / Heating View Scheme

1.1: n-butyllithium / tetrahydrofuran; hexane / 0.5 h / -78 °C 1.2: tetrahydrofuran; hexane / 1 h / -78 °C 2.1: n-butyllithium / tetrahydrofuran; hexane / 0.5 h / -78 °C 2.2: tetrahydrofuran; toluene; hexane / -78 - 20 °C 2.3: 44.0 mg / lithium diisopropylamide / tetrahydrofuran; toluene; hexane / 0.5 h / -78 °C View Scheme

1.1: 96 percent / dimethylformamide / 12 h / 80 °C 2.1: n-butyllithium / tetrahydrofuran; hexane / 0.5 h / -78 °C 2.2: tetrahydrofuran; hexane / 1 h / -78 °C 3.1: n-butyllithium / tetrahydrofuran; hexane / 0.5 h / -78 °C 3.2: tetrahydrofuran; toluene; hexane / -78 - 20 °C 3.3: 44.0 mg / lithium diisopropylamide / tetrahydrofuran; toluene; hexane / 0.5 h / -78 °C View Scheme