4,5-Dihydroxy-2-hydroxymethylene-cyclopenta-3,5-diene-1,3-dicarboxylic acid dimethyl ester 、
(R)-N-(1-cyclohexylethyl)-p-phenylenediamine 以
二氯甲烷 为溶剂,
以95%的产率得到2-{[4-((R)-1-Cyclohexyl-ethylamino)-phenylamino]-methylene}-4,5-dihydroxy-cyclopenta-3,5-diene-1,3-dicarboxylic acid dimethyl ester