1: With trifluoroacetic acid in dichloromethane T=0 - 20°C; 1 h; 2: in methanol

1.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 4 h / 0 - 20 °C 2.1: N-ethyl-N,N-diisopropylamine / 1-methyl-pyrrolidin-2-one / 1 h / 130 °C / Microwave irradiation 3.1: trifluoroacetic acid / dichloromethane / 1 h / 0 - 20 °C 3.2: Amberlyst A-21 View Scheme

1.1: N-ethyl-N,N-diisopropylamine / 1-methyl-pyrrolidin-2-one / 1 h / 130 °C / Microwave irradiation 2.1: trifluoroacetic acid / dichloromethane / 1 h / 0 - 20 °C 2.2: Amberlyst A-21 View Scheme

1.1: sodium hydroxide / water / 1 h / 80 °C 2.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 4 h / 0 - 20 °C 3.1: N-ethyl-N,N-diisopropylamine / 1-methyl-pyrrolidin-2-one / 1 h / 130 °C / Microwave irradiation 4.1: trifluoroacetic acid / dichloromethane / 1 h / 0 - 20 °C 4.2: Amberlyst A-21 View Scheme

1.1: 6 h / Reflux 2.1: sodium hydroxide / water / 1 h / 80 °C 3.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 4 h / 0 - 20 °C 4.1: N-ethyl-N,N-diisopropylamine / 1-methyl-pyrrolidin-2-one / 1 h / 130 °C / Microwave irradiation 5.1: trifluoroacetic acid / dichloromethane / 1 h / 0 - 20 °C 5.2: Amberlyst A-21 View Scheme