4-(3,4-diaminobenzoyl)amino-2,2,6,6-tetramethylpiperidin-1-oxyl 、
4-[{4-(5-formylbenzimidazol-2-yl)benzoyl}amino]-2,2,6,6-tetramethylpiperidin-1-oxyl 以
乙醇 为溶剂,
反应 6.5h,
以48%的产率得到4-[(4-{5-[5-({[(2,2,6,6-tetramethylpiperidin-1-oxyl)-4-yl]amino}carbonyl)benzimidazol-2-yl]benzimidazol-2-yl}benzoyl)amino]-2,2,6,6-tetramethylpiperidin-1-oxyl