Six-Component Azido-Ugi Reaction: from Cyclic Ketimines to Bis-Tetrazole-Derived 5-7-Membered Amines
作者:Irina V. Kutovaya、Danil P. Zarezin、Olga I. Shmatova、Valentine G. Nenajdenko
DOI:10.1002/ejoc.201900244
日期:2019.4.24
The six‐component azido‐Ugi reaction with 2‐substituted 5–7‐membered imines leads to mono‐ or bis‐tetrazole derivatives depending on the starting imines. The reaction is very general regarding isocyanide structure and enables preparation of 1,5‐disubstituted bis‐tetrazole derivatives connected with 5–7‐membered cyclic amine fragments. Subsequent catalytic debenzylation provides the corresponding 1H‐tetrazoles
Transformation of cyclic ketimines to oxaziridines and nitrones
作者:Natalia G. Voznesenskaia、Olga I. Shmatova、Valentine G. Nenajdenko
DOI:10.1016/j.mencom.2017.01.008
日期:2017.1
Treatment of 5-, 6- and 7-membered cyclic ketimines bearing alkyl or aryl group with m-chloroperbenzoic acid proceeds as C=N epoxidation and affords bicyclic oxaziridines in good yields, whose subsequent rearrangement gives nitrones.
From Cyclic Ketimines to α‐Substituted Cyclic Amino Acids and their Derivatives: Influence of Ring Size and Substituents on Stability and Reactivity of Cyclic Aminonitriles
作者:Natalia G. Voznesenskaia、Olga. I. Shmatova、Anna A. Sosnova、Valentine G. Nenajdenko
DOI:10.1002/ejoc.201801087
日期:2019.1.31
A general route to alpha‐substituted cyclic amino acids was elaborated. The approach is based on Strecker reaction with cyclic ketimines. The series of 5–7 membered amino nitriles having different substituents were prepared. Synthesis of alpha‐substituted prolines and their amides was elaborated starting from the corresponding 5‐membered ketimines