Stereoselective allylations of acyclic, chiral α-amino-β-hydroxy aldehydes mediated by BF3·OEt2 and its application to the formal synthesis of the polyhydroxylated γ-amino acid (+)-detoxinine are described. The reactions of syn-α-NHCbz-β-OTBS substrates mediated by BF3·OEt2 afforded syn-selective products. The same reaction conditions gave anti-selective products from syn-α-NCbzBn-β-OTBS substrates
描述了由BF 3 ·OEt 2介导的无环手性α-
氨基-β-羟基醛的立体选择性烯丙基化及其在聚羟基化γ-
氨基酸(+)-脱毒素的形式合成中的应用。由BF 3 ·OEt 2介导的顺式-α-NHCbz-β-OTBS底物的反应提供了顺式选择性产物。相同的反应条件从合成物中得到抗选择性产物-α-NCbzBn-β-OTBS底物。有人提出氢键过渡态和Felkin-Anh模型分别解释了这两个反应的立体
化学结果。一种烯丙基化产物用于多羟基化的γ-
氨基酸(+)-去毒素的形式合成。