(3R,4S,5S)-3,4-Dihydroxy-5-[(methoxycarbonyl-methyl-amino)-methyl]-cyclohex-1-enecarboxylic acid tert-butyl ester 在
lithium hexamethyldisilazane 作用下,
以
四氢呋喃 为溶剂,
反应 18.0h,
以45%的产率得到(4aS,8R,8aS)-8-Hydroxy-3-methyl-2-oxo-3,4,4a,5,8,8a-hexahydro-2H-benzo[e][1,3]oxazine-6-carboxylic acid tert-butyl ester