ethyl (2S)-2-amino-3-(2,6-dimethoxy[1,1'-biphenyl]-4-yl)propanoate 、
3-hydroxy-4,4-dimethyl-2-cyclobutenone 以
4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran 为溶剂,
生成 Ethyl (2S)-2-[(4,4,-dimethyl-3-oxo-1-cyclobutenyl)amino]-3-(2,6-dimethoxy[1,1'-biphenyl]-4-yl)propanoate