Chiral aldimines derived from phenylglycinol were diastereoselectively allylated with indium powder/allyl bromide in alcoholic solvents. Both aliphatic and aromatic aldimines provided good yield of the desired products with high diastereoselectivity. A racemization-free protocol for removal of the phenylglycinol auxiliary was also developed. The stereochemical assignment of the homoallylic amine was
将衍生自苯
甘醇的手性醛
亚胺在
酒精溶剂中与
铟粉/
溴代烯丙基酯非对映选择性地烯丙基化。脂族和芳族醛
亚胺都提供了具有高非对映选择性的所需产物的良好产率。还开发了用于消去苯基
甘醇辅助剂的无消旋方案。通过NMR光谱对均
烯丙基胺进行立体
化学分配,并提出了过渡态模型来解释选择性。