methyl (3S,6S,7R,7aS)-3-tert-butyl-7-hydroxy-6-(2-hydroxyethyl)-7-methyl-5-oxo-3,6-dihydro-1H-pyrrolo[1,2-c][1,3]oxazole-7a-carboxylate 在
pyridinium chlorochromate 作用下,
以
二氯甲烷 为溶剂,
反应 16.0h,
以80%的产率得到methyl (1S,2R,6S,9S)-9-tert-butyl-2-methyl-4,7-dioxo-3,10-dioxa-8-azatricyclo[6.3.0.02,6]undecane-1-carboxylate