achieved in 15 linear steps from silyloxypyrrole 3, utilizing l-glyceraldehyde 4 as the source of chirality. The key steps in the synthesis are three sequential aldol-based carbon−carbon bond-forming reactions: two crossed vinylogous aldol additions (2 + 3 → 8 and 4 + 5 → 10 + 11) and one intramolecular silylative aldolization (6 → 7). En passant, the short syntheses of (2S)-2-hydroxymethylglutamic acid
利用1-
甘油醛4作为手性来源,从甲
硅烷氧基
吡咯3以15个线性步骤完成了对
环戊烷二
羧酸氨基酸1的对映选择性合成,这是一种新型的刚性且功能化的1-谷
氨酸类似物。合成的关键步骤是三个连续的基于羟醛的碳-碳键形成反应:两次交叉的
乙烯基羟醛加成(2 + 3 → 8和4 + 5 → 10 + 11)和一次分子内甲
硅烷基化的羟醛化(6 → 7))。顺便,(2的短合成小号)-2- hydroxymethylglutamic酸(16)和它的(2 - [R )-对映体ENT - 16,一种有效的代谢型谷
氨酸受体激动剂,已经实现。