ethyl 2,3-dihydroxybenzimidate 、
N4-(D-threonyl)-N1,N7-bis(2,3-dihydroxybenzoyl)norspermidine hydrochloride 以
甲醇 为溶剂,
反应 30.0h,
以63%的产率得到(4R,5S)-2-(2,3-Dihydroxy-phenyl)-5-methyl-4,5-dihydro-oxazole-4-carboxylic acid bis-[3-(2,3-dihydroxy-benzoylamino)-propyl]-amide