cyclopentyl 6-methyl-2-oxo-4-[4-(trifluoromethyl)phenyl]-3,4-dihydro-1H-pyrimidine-5-carboxylate 生成 cyclopentyl (4R)-6-methyl-2-oxo-4-[4-(trifluoromethyl)phenyl]-3,4-dihydro-1H-pyrimidine-5-carboxylate 、 cyclopentyl (4S)-6-methyl-2-oxo-4-[4-(trifluoromethyl)phenyl]-3,4-dihydro-1H-pyrimidine-5-carboxylate