Diethyl N-<4-<1-(tetrahydropyranyl-2'-oxy)-3-(2-(pivaloylamino)-3,4-dihydro-4-oxo-5,6,7,8-tetrahydropyrido<2,3-d>pyrimidin-6-yl)prop-2-yl>benzoyl>-L-glutamate 在
sodium carbonate 作用下,
以
methanolic hydrogen chloride 、
二氯甲烷 、
水 为溶剂,
以810 mg (98%)的产率得到2-(4-{2-[2-(2,2-Dimethyl-propionylamino)-4-oxo-3,4,5,6,7,8-hexahydro-pyrido[2,3-d]pyrimidin-6-yl]-1-hydroxymethyl-ethyl}-benzoylamino)-pentanedioic acid diethyl ester