Saturated nitrogen heterocycles are essential pharmacophores in drugs and natural products, and general methods for their enantioselective synthesis are still highly sought after. A new direct approach utilizing hemiaminal methyl ethers as N-acyliminium precursors for the enantioselective preparation of cyclic, aliphatic and 2-subsituted pyrrolidines, piperidines and azepanes has been achieved.
饱和氮杂环是药物和
天然产物中重要的药效基团,其对映选择性合成的通用方法仍然备受追捧。一种新的直接方法利用
半缩醛胺甲基醚作为N-
酰亚胺前体,用于对映选择性制备环状、脂肪族和2-取代的
吡咯烷、
哌啶和氮杂
环庚烷。