Novel conformationally constrained glutamate analogues are readily available from (S)-pyroglutamic acid; using a bicyclic lactam template, diastereocontrolled and sequential modification of the pyrrolidine ring is possible, allowing a versatile access to several glutamate and kainoid analogues; variations in the C(2)H–C(3)H coupling constants were observed depending upon the nature of remote substituents on the heterocyclic ring, consistent with modification of the ring conformation.
从(S)-焦谷
氨酸中很容易获得构象受限的新型谷
氨酸类似物;利用双环内酰胺模板,可以对
吡咯烷环进行非对映控制和顺序修饰,从而获得多种谷
氨酸和类缬
氨酸类似物;根据杂环上的远程取代基的性质,可以观察到 C(2)H-C(3)H 耦合常数的变化,这与环构象的改变是一致的。