N,N'-Dimethylethylenediamine → Tert-butyl 3-[4-(methoxycarbonyl)phenyl]-2-oxo-1-oxa-3,8-diazaspiro[4.5]decane-8-carboxylate

Participants

Reaction Steps

A mixture of cesium carbonate (4.27 g, 13.11 mmol), copper (I) iodide (0.832 g, 4.37 mmol), tert-butyl 2-oxo-1-oxa-3,8-diazaspiro[4.5]decane-8-carboxylate (1.12 g, 4.37 mmol), N,N′-dimethylethane-1,2-diamine (0.385 g, 437 mmol) and methyl 4-bromobenzoate (1.128 g, 5.24 mmol) was heated under nitrogen for 18 hours. The crude mixture was filtered through celite. Upon removal of the volatiles, the crude was purified by flash chromatography (EtOAc/hexanes 20 to 100%) to afford the title intermediate as a white solid.

Provenance & Evidence