1.1: lithium aluminium tetrahydride / tetrahydrofuran / Inert atmosphere; Cooling with ice 2.1: N-ethyl-N,N-diisopropylamine / N,N-dimethyl-formamide / 5 h / 20 °C / Inert atmosphere 3.1: silica gel; pyridinium chlorochromate / dichloromethane / 3 h / 20 °C / Inert atmosphere 4.1: n-butyllithium / tetrahydrofuran; hexane / 0.25 h / -78 °C / Inert atmosphere 4.2: -78 - 20 °C / Inert atmosphere 5.1: methanol; acetyl chloride / 20 °C / Inert atmosphere 6.1: silica gel; pyridinium chlorochromate / dichloromethane / Inert atmosphere View Scheme

1.1: n-butyllithium / tetrahydrofuran; hexane / 0.25 h / -78 °C / Inert atmosphere 1.2: -78 - 20 °C / Inert atmosphere 2.1: methanol; acetyl chloride / 20 °C / Inert atmosphere 3.1: silica gel; pyridinium chlorochromate / dichloromethane / Inert atmosphere View Scheme

1.1: silica gel; pyridinium chlorochromate / dichloromethane / 3 h / 20 °C / Inert atmosphere 2.1: n-butyllithium / tetrahydrofuran; hexane / 0.25 h / -78 °C / Inert atmosphere 2.2: -78 - 20 °C / Inert atmosphere 3.1: methanol; acetyl chloride / 20 °C / Inert atmosphere 4.1: silica gel; pyridinium chlorochromate / dichloromethane / Inert atmosphere View Scheme

[Rh(dppe)(NBD)]ClO4; hydrogen in dichloromethane T=20°C; 120 h;

2-mesityl-2,5,6,7-tetrahydropyrrolo[2,1-c][1,2,4]triazol-4-ium chloride; triethylamine in toluene T=80°C; 12 h; Reagent/catalystTemperatureSolventTime;