A general catalytic enantioselective method that can produce five-, six-, and seven-membered N-heterocycles possessing various ketone moieties starting from stable and easily available cyclic hemiaminals and ketones was developed. The method involves three successive steps in one pot (aldol addition, dehydration, and enantioselective intramolecular aza-Michael reaction), all of which are promoted by
Catalytic Asymmetric Additions of Enol Silanes to In Situ Generated Cyclic, Aliphatic
<i>N</i>
‐Acyliminium Ions
作者:Oleg Grossmann、Rajat Maji、Miles H. Aukland、Sunggi Lee、Benjamin List
DOI:10.1002/anie.202115036
日期:2022.2.21
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.