(S)‐malic acid is described. The chiral cyclic imide derived from (S)‐malic acid was converted to an acetoxylactam by reduction with sodium borohydride followed by acetylation. The obtained acetoxylactam was treated with trimethylsilyl cyanide in the presence of boron trifluoride etherate to give the corresponding cyanolactam in high yield, even though the diastereoselectivity of the cyanation reaction was
摘要描述了通过
氰化衍生自 (S)-
苹果酸的 N-acyliminium 中间体轻松合成
3-羟基谷氨酸。衍生自(S)-
苹果酸的手性环状
酰亚胺通过用
硼氢化钠还原然后乙酰化转化为乙酰氧基内酰胺。所得乙酰氧基内酰胺在
三氟化硼醚合物存在下用三甲基甲
硅烷基
氰化物处理以高产率得到相应的
氰内酰胺,即使
氰化反应的非对映选择性适中。
氰内酰胺的非对映异构体可通过色谱分离并独立转化为 (2R,3S)- 和 (2S,3S)-
3-羟基谷氨酸。