1: With sodium nitrite 2: With hydrogenchloride; tin(ll) chloride

1.1: sodium hydrogencarbonate; iodine / dichloromethane / 25 - 30 °C 2.1: dichloromethane / 1.5 h / 25 °C 3.1: copper(l) iodide; lithium chloride / N,N-dimethyl-formamide / 0.5 h / 25 °C 3.2: 25 °C 4.1: potassium hydroxide; ethanol / 15 - 25 °C 5.1: potassium tert-butylate / 1-methyl-pyrrolidin-2-one / 80 - 85 °C 5.2: 0.5 h / 25 °C View Scheme

1.1: sodium hydrogencarbonate; iodine / dichloromethane / 25 - 30 °C 2.1: dichloromethane / 1.5 h / 25 °C 3.1: copper(l) iodide; lithium chloride / N,N-dimethyl-formamide / 0.5 h / 25 °C 3.2: 25 °C 4.1: potassium hydroxide; ethanol / 15 - 25 °C 5.1: potassium tert-butylate / 1-methyl-pyrrolidin-2-one / 80 - 85 °C 5.2: 0.5 h / 25 °C 6.1: trifluoroacetic acid / ethanol / 25 °C / Reflux 6.2: 10 - 15 °C / pH 8 7.1: hydrogen; acetic acid / palladium 10 on activated carbon / 25 °C / 1448.05 - 2172.08 Torr 7.2: 10 °C / pH 7.5 - 8.5 View Scheme

1.1: sodium hydrogencarbonate; iodine / dichloromethane / 25 - 30 °C 2.1: dichloromethane / 1.5 h / 25 °C 3.1: copper(l) iodide; lithium chloride / N,N-dimethyl-formamide / 0.5 h / 25 °C 3.2: 25 °C 4.1: potassium hydroxide; ethanol / 15 - 25 °C 5.1: potassium tert-butylate / 1-methyl-pyrrolidin-2-one / 80 - 85 °C 5.2: 0.5 h / 25 °C 6.1: trifluoroacetic acid / ethanol / 25 °C / Reflux 6.2: 10 - 15 °C / pH 8 View Scheme

1.1: sodium hydrogencarbonate; iodine / dichloromethane / 25 - 30 °C 2.1: dichloromethane / 1.5 h / 25 °C 3.1: copper(l) iodide; lithium chloride / N,N-dimethyl-formamide / 0.5 h / 25 °C 3.2: 25 °C 4.1: potassium hydroxide; ethanol / 15 - 25 °C 5.1: potassium tert-butylate / 1-methyl-pyrrolidin-2-one / 80 - 85 °C 5.2: 0.5 h / 25 °C 6.1: trifluoroacetic acid / ethanol / 25 °C / Reflux 6.2: 10 - 15 °C / pH 8 7.1: hydrogen; acetic acid / palladium 10 on activated carbon / 25 °C / 1448.05 - 2172.08 Torr 7.2: 10 °C / pH 7.5 - 8.5 8.1: hydrogenchloride / isopropyl alcohol; acetone / 5 - 10 °C / pH 1 View Scheme

1.1: sodium hydrogencarbonate; iodine / dichloromethane / 25 - 30 °C 2.1: methanol / 25 - 30 °C 2.2: 4 h / 25 - 30 °C 3.1: copper(l) iodide; lithium chloride / N,N-dimethyl-formamide / 0.5 h / 25 °C 3.2: 25 °C 4.1: potassium hydroxide; ethanol / 15 - 25 °C 5.1: potassium tert-butylate / 1-methyl-pyrrolidin-2-one / 80 - 85 °C View Scheme

1.1: sodium hydrogencarbonate; iodine / dichloromethane / 25 - 30 °C 2.1: methanol / 25 - 30 °C 2.2: 4 h / 25 - 30 °C 3.1: copper(l) iodide; lithium chloride / N,N-dimethyl-formamide / 0.5 h / 25 °C 3.2: 25 °C 4.1: potassium hydroxide; ethanol / 15 - 25 °C 5.1: potassium tert-butylate / 1-methyl-pyrrolidin-2-one / 80 - 85 °C 6.1: potassium hydroxide / methanol / 8 h / 60 - 65 °C View Scheme