6-(4-[1,3]Dioxolan-2-yl-4-methyl-2-oxovaleroylamino)-4-methyl-2,3-benzoxazin-1-one 、
phenylmagnesium bromide 以
四氢呋喃 为溶剂,
以After column chromatography, 317 mg of product were obtained的产率得到rac-6-[4-[1,3]dioxolan-2-yl-2-hydroxy-4-methyl-2-phenylvaleroylamino]-4-methyl-2,3-benzoxazin-1-one