Cesium carbonate → 2-Diazoindane-1,3-dione

Beteiligte Stoffe

Reaktionsschritte

To a suspension of sodium azide (2.4 g, 36.3 mmol) in CH3CN (73 mL) was added methanesulfonyl chloride (2.8 mL, 36.3 mmol). After stirring for 16 h, the reaction mixture was poured over a suspension of indan-1,3-dione (5.3 g, 36.3 mmol) and cesium carbonate (11.8 g, 36.3 mmol) in CH3CN (50 mL). The mixture was stirred until reaction was complete (2 h), and then filtered through Celite. The filter cake was washed with EtOAc and the organic solvents were removed in vacuo. The resulting gum was diluted with EtOAc and rinsed successively with NaOH (1N), H2O and brine. The organic layer was dried (MgSO4), evaporated and the crude oil purified by flash chromatography (SiO2, 50% hexane/EtOAc) to give 2-diazoindan-1,3-dione (2a) (2.6 g, 42% yield).

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