申请人:Genentech, Inc.
公开号:US11325912B2
公开(公告)日:2022-05-10
A method of regio-selectively synthesizing an imidazo-pyrimidine compound of formulae (XXa) or (XXb)
comprising a step of coupling a first compound of formula XX-P1a or XX-P1b with a second compound of formula XX-P2
This annulation reaction between β-ethoxy acrylamides and phosphorylated aminoimidazoles to furnish imidazo[1,2-a]pyrimidin-amines relies on steering effects from endocyclic and exocyclic phosphorylated aminoimidazoles. The reaction furnishes either 2-amino or 4-amino constitutional isomers of imidazo[1,2-a]pyrimidines with good yields and ranges of 90:10-99:1 regio-selectivity. The reaction is useful in the synthesis of various tracer molecules used in the study of neurological conditions such as where R3 and R4 together with the imidazole ring atoms to which they are bonded form a phenyl ring and the products are substituted benzimidazopyrimidines. The reaction can be generalized to form imidazo[1,2-a]pyrimidines substituted at either of their 2- and 4-positions by alkoxy or thioalkyl groups.
一种选择性地合成式(XXa)或(XXb)咪唑嘧啶化合物的方法
包括将式 XX-P1a 或 XX-P1b 的第一种化合物与式 XX-P2 的第二种化合物偶联的步骤
β-乙氧基丙烯酰胺与磷酸化氨基咪唑之间的环化反应生成咪唑并[1,2-a]嘧啶胺依赖于内环和外环磷酸化氨基咪唑的转向效应。该反应可生成咪唑并[1,2-a]嘧啶的 2-氨基或 4-氨基构型异构体,产率高,区域选择性范围为 90:10-99:1。该反应可用于合成用于研究神经系统疾病的各种示踪分子,如 R3 和 R4 与它们所结合的咪唑环原子一起形成一个苯基环,而产物则是取代的苯并咪唑嘧啶。该反应可以推广到在咪唑并[1,2-a]嘧啶的 2 位和 4 位上形成被烷氧基或硫代烷基取代的咪唑并[1,2-a]嘧啶。