3-[6-(azetidine-1-carbonyl)pyridin-3-yl]oxy-5-(1-cyclobutyl-2-oxo-pyrrolidin-3-yl)oxy-N-(5-methylpyrazin-2-yl)benzamide 以47%的产率得到3-[6-(azetidine-1-carbonyl)pyridin-3-yl]oxy-5-[(3R)-1-cyclobutyl-2-oxo-pyrrolidin-3-yl]oxy-N-(5-methylpyrazin-2-yl)benzamide