The versatile âring switchingâ approach to antagonists of glutamate receptors has been extended to the use of δ-lactam urethanes. Three different types of δ-lactam urethane aldehydes 17, 26 and 59 have been used successfully in this approach. Altering diastereoisomeric ratios in the synthesis by use of a hindered proton source has allowed homochiral products with two chiral centres to be obtained. Although the δ-lactam urethane system did not prove to be as versatile as the corresponding pyroglutamate or β-lactam urethanes, a variety of homologues of glutamate antagonists have been prepared.
谷
氨酸受体拮抗剂的多功能 "环状转换 "方法已扩展到δ-内酰胺
氨酯的使用。三种不同类型的δ-内酰胺
脲醛 17、26 和 59 已成功用于这种方法。通过使用受阻质子源来改变合成过程中的非对映异构体比例,可以获得具有两个手性中心的同手性产物。虽然事实证明δ-内酰胺
氨酯体系不像相应的焦谷
氨酸
氨酯或δ-内酰胺
氨酯那样用途广泛,但还是制备出了多种谷
氨酸拮抗剂的同系物。