The abnormal reluctance of piperazic acids to undergo N-2 acylation seems to be due to an electronic effect, not a steric / conformational problem. A system suitable for probing these issues was assembled by methods that have produced a versatile building block for β-hydroxy-α-aminoacids of either relative stereochemistry and of either (L) or (D) configuration.
哌嗪酸不愿意进行N-2酰化似乎是由于电子效应,而不是空间/构象问题。通过产生相对立体
化学和(L)或(D)构型的β-羟基-
α-氨基酸的通用结构单元的方法组装了适合于研究这些问题的系统。