1,8-diazabicyclo[5.4.0]undec-7-ene in tetrahydrofuran T=60°C; 4 h; Inert atmosphere;

hydrogenchloride; chloroform

1: potassium carbonate / methanol / 1 h / 20 °C / Inert atmosphere 2: N,N,N',N,-tetramethylethylenediamine; oxygen; copper(l) chloride / acetone / 2 h / 20 °C 3: 1,8-diazabicyclo[5.4.0]undec-7-ene / tetrahydrofuran / 4 h / 60 °C / Inert atmosphere View Scheme

1: N,N,N',N,-tetramethylethylenediamine; oxygen; copper(l) chloride / acetone / 2 h / 20 °C 2: 1,8-diazabicyclo[5.4.0]undec-7-ene / tetrahydrofuran / 4 h / 60 °C / Inert atmosphere View Scheme

1.1: n-butyllithium / tetrahydrofuran; hexane / 0.5 h / -30 °C / Inert atmosphere 1.2: -78 °C / Inert atmosphere 2.1: potassium carbonate / methanol / 1 h / 20 °C / Inert atmosphere 3.1: N,N,N',N,-tetramethylethylenediamine; oxygen; copper(l) chloride / acetone / 2 h / 20 °C 4.1: 1,8-diazabicyclo[5.4.0]undec-7-ene / tetrahydrofuran / 4 h / 60 °C / Inert atmosphere View Scheme

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