Novel conformationally constrained glutamate analogues are readily available from (S)-pyroglutamic acid using a bicyclic lactam as a synthetic template; diastereocontrolled modification of the pyrrolidine ring using a sequential conjugate addition–substitution strategy permits access to several kainoid analogues in a versatile strategy. The pyrrolidinone ring conformation appears to be controllable by the nature of remote substituents on the heterocyclic ring.
利用双环内酰胺作为合成模板,可以很容易地从(S)-焦谷
氨酸中获得构象受限的新型谷
氨酸类似物;利用顺序共轭加成-取代策略对
吡咯烷环进行非对映控制修饰,可以通过多功能策略获得多种类缬
氨酸类似物。
吡咯烷酮环的构象似乎可以通过杂环上的远程取代基的性质来控制。