Sodium hydride → 5-Oxo-4-(3-piperidin-1-yl-propyl)-[1,4]diazepane-1-carboxylic acid tert-butyl ester

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Reaction Steps

A solution of 8.52 g (39.75 mmol) of 5-oxo-[1,4]diazepane-1-carboxylic acid tert-butyl ester in 200 ml of DMA was treated at 0° C. with 2.60 g (59.62 mmol) of NaH (55% in oil) in small portions. The reaction was stirred 1 h at this temperature, then the free 1-(3-chloropropyl)piperidine in 200 ml toluene was dropped in (49.62 g (250.42 mmol, 6.3 eq.) 1-(3-chloropropyl)piperidine hydrochloride were dissolved in 262 ml of 1N NaOH and extracted with toluene (200 ml). The organic phase was dried over Na2SO4). The reaction was warmed up to RT and stirred over night. After 2 h at 50° C. and cooling to RT, the reaction was neutralized with water (50 ml), evaporated and then dissolved in aqueous saturated NaHCO3/Et2O. After reextraction with Et2O, the organic phase was dried (Na2SO4), evaporated and crystallized from pentane to yield 12.08 g (90%) of the title compound as white crystals. MS: 340.2 (MH+).

Provenance & Evidence