2-碘-6-三氟甲基吡啶 、
(R)-tert-butyl 2-hydroxy-2-((R)-3-oxomorpholin-2-yl)propanoate 、
5-溴-1-(二氟甲基)吡啶-2(1H)-酮 、
3-氨基吡唑 以to obtain compound 3-1 as a colorless solid的产率得到(R)-tert-butyl 2-hydroxy-2-((R)-3-oxo-4-(6-(trifluoromethyl)pyridin-2-yl)morpholin-2-yl)propanoate