(R)-methoxytrifluoromethylphenylacetyl chloride 、
(7R,8S)-8-ethyl-7-hydroxy-2,3,8-trimethyl-5,6,7,8-tetrahydro-4H-chromen-4-one 在
吡啶 作用下,
反应 1.5h,
以65%的产率得到(R)-3,3,3-Trifluoro-2-methoxy-2-phenyl-propionic acid (7R,8S)-8-ethyl-2,3,8-trimethyl-4-oxo-5,6,7,8-tetrahydro-4H-chromen-7-yl ester