3-(3-chlorophenylethynyl)-7-carbamoyl-1-oxa-2,7-diazaspiro[4.4]non-2-ene 、
3-(3-chlorophenylethynyl)-1-oxa-2,7-diazaspiro[4.4]non-2-ene 在
2-[2-(3-Chlorophenyl)ethynyl]-4-oxa-3,8-diazaspiro[4.5]dec-2-ene-8-carboxamide 、 Petroleum Ether-EtOAc 作用下,
生成 2-[2-(3-Chlorophenyl)ethynyl]-4-oxa-3,8-diazaspiro[4.5]dec-2-ene-8-carboxamide