The Strecker reaction of the product from the treatment of the sodium salt of γ-keto acids with (S)-phenylglycinol followed by heating the products to 200 °C gives the bicyclic lactones 9 and 10. Alkylation of 9 provides 11 and 12. Both 9b and 11a are converted into the corresponding substituted glutamic acids via reductive cleavage and hydrolysis.
由γ-
酮酸的
钠盐与(S)-
苯基甘
氨醇处理的产物的Strecker反应,然后将产物加热至200℃,得到双环内
酯9和10。9的烷基化提供11和12。两个图9b和11a中被转换成相应的取代的谷
氨酸通过还原裂解和
水解。