cis-dimethyl cyclobutene-3,4-dicarboxylate 、
2-重氮丙烷 以
乙醚 为溶剂,
生成
(1S,5S,6R,7R)-4,4-Dimethyl-2,3-diaza-bicyclo[3.2.0]hept-2-ene-6,7-dicarboxylic acid dimethyl ester 、 (1S,5S,6R,7R)-4,4-Dimethyl-2,3-diaza-bicyclo[3.2.0]hept-2-ene-6,7-dicarboxylic acid dimethyl ester