4-(2-oxo-1-oxa-3,8-diazaspiro[4.5]dec-3-yl)benzoic acid hydrochloride 、
4-chloro-3-ethylbenzaldehyde 在
4-[8-(4-chloro-3-ethylbenzyl)-2-oxo-1-oxa-3,8-diazaspiro[4.5]dec-3-yl]benzoic acid 、
acetonitrile-water 作用下,
以to provide the title compound as a white solid (12 mg)的产率得到4-[8-(4-chloro-3-ethylbenzyl)-2-oxo-1-oxa-3,8-diazaspiro[4.5]dec-3-yl]benzoic acid