similar strategy was implemented for the DCM formylation reaction. It was found that the 1,2-boronate rearrangement for the formylation reaction could be temperature-controlled, thus preventing overaddition of the DCM anion and rendering the process reproducible. The robust stereospecific boronate rearrangement and formylation were utilized for the practical asymmetric synthesis of a chiral quaternary FLAP
已经开发了一种实际序列,包括非低温立体定向
硼酸酯重排,然后与原位生成的DCM阴离子进行牢固的甲酰化,以实现F
LAP
抑制剂全碳季立体中心的不对称构建。通过使用
LDA作为碱,并用
硼酸酯原位捕获不稳定的
锂化苄基
氨基甲酸酯,可以使关键的
硼酸酯重排不致低温且坚固耐用。DCM甲酰化反应也采用了类似的策略。发现用于甲酰化反应的1,2-
硼酸酯重排可以被控制温度,从而防止DCM阴离子的过量添加并使得该过程可再现。