(4aS,7R)-7-(2-Hydroxy-ethyl)-3-((S)-4-hydroxy-pentyl)-1-oxo-1,2,4a,5,6,7-hexahydro-pyrrolo[1,2-c]pyrimidine-4-carboxylic acid methyl ester 在
对甲苯磺酸 作用下,
以
氯仿 为溶剂,
以100%的产率得到methyl (3S,4S,4aS,6'S,7R)-7-(2-hydroxyethyl)-6'-methyl-1-oxospiro[2,4,4a,5,6,7-hexahydropyrrolo[1,2-c]pyrimidine-3,2'-oxane]-4-carboxylate