、
(R)-3-苯基丁酸甲酯 、
4-(环戊基氨基)-2-(甲基硫代)-5-嘧啶羧醛 在
ethyl acetate hexanes 作用下,
以gave 8-cyclopentyl-2-methylsulfanyl-6-(1-phenyl-ethyl)-8H-pyrido[2,3-d]pyrimidin-7-one as a pink foam (3.90 g, 10.67 mmol, 79%)的产率得到8-cyclopentyl-2-methylsulfanyl-6-(1-phenyl-ethyl)-8H-pyrido[2,3-d]pyrimidin-7-one