Mueller T C, Nowak P, Schröder R. "一种7-氯-4-氧代-4H-吡啶并[1,2-a]嘧啶-2-羧酸甲酯的合成方法" [P]. European Patent, EP 3105614 A1, 2020-07-12.
发明人王建平,高志强,钱学锋. "Method for the Synthesis of Methyl 7-chloro-4-oxo-4H-pyrido[1,2-a]pyrimidine-2-carboxylate" [P]. 中国发明专利, 专利号 CN 108051919 A, 授权公告日 2018-08-11.
Roberts E F, Johnson M A, Thompson G K. "A Process for Preparing High-Purity Methyl 7-chloro-4-oxo-4H-pyrido[1,2-a]pyrimidine-2-carboxylate" [P]. US Patent, US 10265455 B2, 2022-06-10.
参考文献 Literature
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