Synthesis of heterocyclic enamine-zinc complexes as precursors of stereocontrolled substitution of nitrogen α-position
作者:Hoang-Van Tran、Huy-Dinh Vu、Jérôme Graton、Denis Jacquemin、Jacques Renault、Philippe Uriac
DOI:10.1016/j.tetlet.2020.152405
日期:2020.10
In the presence of ZnCl2, chiral protected amino-ketones and amino-aldehydes gave zinc enamino-complexes. Both enamine and iminium structures of these complexes were observed in 1H and 13C NMR spectra depending on the solvent. Introduction of either an allyl or a hydrogen substituent was performed using allylmagnesium chloride or NaBH4 in excess leading to various heterocycles. With the amino-ketones
在存在ZnCl 2的情况下,手性保护的氨基酮和氨基醛得到锌的氨基复合物。根据溶剂的不同,在1 H和13 C NMR光谱中观察到了这些配合物的烯胺和亚胺鎓结构。使用过量的烯丙基氯化镁或NaBH 4进行烯丙基或氢取代基的引入,从而导致各种杂环。用氨基酮 分别观察到非对映选择性(de= 50)。通过该策略制备高可可碱和甜氨酸前体。