Various substituents could be diastereoselectively introduced into the 5-position of pipecolic acid via electrophilic or free-radical-initiated addition to the carbon–carbon double bond of endocyclic enecarbamates derived from pipecolic acid. This study allowed the diastereoselective synthesis of both cis- and trans-5-guanidino pipecolates, which were designed as constrained arginine mimetics and whose potential inhibition of nitric oxide synthase (NOS) was evaluated with three NOS isoforms.
各种取代基可以通过电亲核反应或自由基引发的方式,选择性地引入到
哌啶酸的5位。这是通过对来源于
哌啶酸的内环烯酰胺的碳碳双键进行加成反应实现的。该研究实现了顺式和反式5-
氨基脯
氨酸的选择性合成,这些化合物被设计为受限的精
氨酸类似物,并且对三种
一氧化氮合酶(NOS)异构体的潜在抑制作用进行了评估。