The nucleus of the carbacephem antibiotic loracarbef was synthesized in a highly efficient and enantioselective fashion from 2S,3S-2-amino-3-hydroxy-6-heptenoic acid (AHHA), which was derived from enzyme-catalyzed condensation of glycine and 4-pentenaldehyde. The bicyclic framework of this compound was established through sequential Mitsunobu reaction and aldol condensations.
羧苄
青霉素抗生素洛拉卡培的细胞核是由2 S,3 S -2-
氨基-3-羟基-
6-庚烯酸(AHHA)高效和对映选择性地合成的,AHHA是由酶催化的甘
氨酸缩合而成。 4-
戊醛。通过连续的Mitsunobu反应和醛醇缩合建立了该化合物的双环骨架。