Diisopropylethylamine → 4-[5-(5-Bromo-furan-2-yl)-[1,3,4]oxadiazol-2-yl]-1,4-diaza-bicyclo[3.2.2]nonane

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Reaction Conditions

Reaction Steps

A mixture of 1,4-diazabicyclo[3.2.2]nonane (4.05 g, 32.1 mmol), 2-benzylsulfanyl-5-(5-bromo-furan-2-yl)-[1,3,4]oxadiazole (10.3 g, 30.5 mmol) and N,N-diisopropylethylamine (8.29 g, 64.1 mmol) was stirred at 100° C. for 4 hours. Aqueous sodium hydroxide (30 ml, 1 M) was added followed by extraction with chloroform (3×30 ml). The organic phase was dried and evaporated. The crude solid mixture was solved in hot ethyl acetate (100 ml), some red, glue-like impurities where removed by filtration. The filtrate was evaporated and finally the crystalline product was triturated with diethylether. Yield 3.43 g (33%). LC-ESI-HRMS of [M+H]+ shows 339.0453 Da. Calc. 339.045664 Da, dev. −1.1 ppm.

Provenance & Evidence