Novel conformationally constrained pyroglutaminols and pyroglutamates are readily available using an α,β-unsaturated bicyclic lactam as a template for diastereocontrolled enolate additions in the key step; zinc enolates are particularly effective in this regard. The bicyclic ring system both controls and permits the determination of ring stereochemistry. The utility of this methodology is demonstrated by a formal total synthesis of the NMDA receptor agonist, CPAA 11.
使用 α,β-不饱和双环内酰胺作为关键步骤中非对映控制烯醇化物添加的模板,可以轻松获得新型构象受限的焦谷
氨酰胺和焦谷
氨酸;烯醇
锌在这方面特别有效。双环系统既控制又允许测定环立体
化学。 N
MDA 受体激动剂 CP
AA 11 的正式全合成证明了该方法的实用性。