3-[5,6-bis(methyloxy)-2-pyridinyl]-2,4-dioxo-1,2,3,4-tetrahydropyrido[4,3-d]pyrimidine-7-carboxylic acid 、
alpha-甲基-4-(甲基磺酰基)苄胺 在
三乙胺 、 Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以46%的产率得到3-[5,6-bis(methyloxy)-2-pyridinyl]-N-{1-[4-(methylsulfonyl)phenyl]ethyl}-2,4-dioxo-1,2,3,4-tetrahydropyrido[4,3-d]pyrimidine-7-carboxamide