Selective monobenzylation of 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) to yield an AB linear monomer and analogous linear oligomers
作者:Joseph A. Giesen、Scott M. Grayson
DOI:10.1016/j.tetlet.2020.152016
日期:2020.6
synthesis utilizes a generic acid-catalyzed esterification of bis-MPA to the ethyl ester. Subsequently, a selective mono-benzylation mediated by silver(I) oxide affords the monobenzyl ether of the ethyl ester. Finally, a simple base hydrolysis of monobenzyl ether ethyl ester yields 3-(benzyloxy)-2-(hydroxymethyl)-2-methylpropanoic acid, the AB monomer. This synthesis was utilized to generate gram quantities
探索了基于双-MPA的单苄基AB单体的合成,并通过三步合成而无需柱色谱法完成。这种优化的合成方法利用了双-MPA的通用酸催化酯化为乙酯。随后,由氧化银(I)介导的选择性单苄基化作用提供了乙酯的单苄基醚。最后,单苄基醚乙酯的简单碱水解产生3-(苄氧基)-2-(羟甲基)-2-甲基丙酸,AB单体。该合成用于产生克量的线性单体(产率为47%),并且该单体用于生产少量的线性聚合物类似物。尽管有许多bis-MPA的分支类似物,但这是第一个被证实的线性低聚物。