Tert-butyl 2-oxo-1-oxa-3,7-diazaspiro[4.5]decane-7-carboxylate 、
5-溴-2-硝基吡啶 以gave 3-(6-Nitro-pyridin-3-yl)-2-oxo-1-oxa-3,7-diaza-spiro[4.5]decane-7-carboxylic acid tert-butyl ester as a brown solid (0.709 g, 1.735 mmol) in 81% yield的产率得到3-(6-nitropyridin-3-yl)-2-oxo-1-oxa-3,7-diazaspiro[4.5]decane-7-carboxylic acid tert-butyl ester