Optically pure 4-formyl-3-hydroxy β-lactams are transformed into 4-methylaryl and 4-(2-ethylaryl) derivatives and converted into β-substituted alanine-derived NCAs through oxidation and Baeyer–Villiger rearrangement of the resulting α-keto β-lactams.
光学纯的4-甲酰基-3-羟基β-内酰胺被转化为4-甲基芳基和4-(2-乙基芳基)衍
生物,并通过氧化和α-酮基的Baeyer-Villiger重排转化为β-取代的丙
氨酸衍生的NCA。 β-内酰胺。