(5S,6S)-7-Oxo-6-((R)-1-phenyl-ethylamino)-2,3,5,6-tetrahydro-1H,7H-7a,12,12b-triaza-naphtho[2,3-e]azulene-5-carboxylic acid ethyl ester 在
silica gel 作用下,
以
氘代氯仿 为溶剂,
生成 (3aS,5S,15S)-15-ethoxycarbonyl-4-((R)-1-phenylethyl)-1,2,3,3a,4,5-hexahydro-3a,5-ethanopyrrolo[b]pyrido[1',2':1,2]pyrimido[4,5-d]pyrimidin-6(6H)-one