The synthesis of α,γ-substituted chiral γ-lactones was quickly achieved in a one pot sequential process. The procedure involves an enantioselective organocatalysed transfer of boronic acid to 5-hydroxyfuran-2(5H)-one, followed by an intramolecular diastereoselective Passerini-type reaction. The methodology was developed and optimized with N-Boc-indole-2-boronic acid giving access to α-indole-γ-substituted
α,γ-取代的手性γ-内酯的合成可以在一锅的顺序过程中快速完成。该方法涉及将对映体有机催化的
硼酸转移至5-羟基
呋喃-2(5 H)-1 ,然后进行分子内非对映选择性Passerini型反应。用N -Boc-
吲哚-2-
硼酸开发和优化了该方法,可以高产率获得高α-
吲哚-γ-取代的内酯,非对映异构体和对映异构体的比例也很高。通过将该方法应用于其他
硼酸,尽管具有较低的对映选择性,但也以良好的产率实现了结构上多样化的α,γ-取代的手性内酯的合成。