Ethyl 5-ethynyl-4-methylthiophene-2-carboxylate 、
2-pivaloyl-6-bromo-5-deazapterin 在
palladium diacetate
三乙胺 、
三苯基膦 作用下,
以
乙腈 为溶剂,
以68%的产率得到ethyl 5-[2-[2-(2,2-dimethylpropanoylamino)-4-oxo-3H-pyrido[2,3-d]pyrimidin-6-yl]ethynyl]-4-methylthiophene-2-carboxylate