Guanidine Synthesis: Use of Amidines as Guanylating Agents
作者:Mattijs Baeten、Bert U. W. Maes
DOI:10.1002/adsc.201501146
日期:2016.3.3
hindered, oxidation‐sensitive and chiral amines. Examples for the synthesis of both acyclic and cyclic guanidines are provided. 2‐Propoxyphenyl iodide (2‐PrOPhI) by‐product, generated from the oxidant [N‐(p‐toluenesulfonyl)imino](2‐propoxyphenyl)iodinane (2‐PrOPhINTs), can be isolated in high yields making regeneration of the hypervalent iodine reagent possible. The utility and greenness of the synthetic
Synthesis of Secondary Amides from<i>N</i>-Substituted Amidines by Tandem Oxidative Rearrangement and Isocyanate Elimination
作者:Pradip Debnath、Mattijs Baeten、Nicolas Lefèvre、Stijn Van Daele、Bert U. W. Maes
DOI:10.1002/adsc.201400648
日期:2015.1.12
The periodinane reagents are obtained from the commercially available phenyliodine(III) diacetate [PhI(OAc)2, (PIDA)] by ligand exchange with carboxylic acids. The N‐substituted amidine substrates are easily synthesized from readily available nitriles. The method is applicable for secondary amide synthesis, based on both aliphatic and (hetero)aromatic amines, including challenging amides consisting
A base-promoted formal [4 + 1+1] annulation of aldehyde, N-benzyl amidine and DMSO was developed, leading to a series of 2,4,6-triaryl pyrimidines in moderate to good yields. Notably, DMSO served as a methine source, which was activated by base rather than either Lewis acid or electrophile. Molecular O-2 was the sole eco-friendly oxidant during this procedure. (C) 2017 Published by Elsevier Ltd.
Chemoselective synthesis of 5,4′-imidazolinyl spirobarbiturates <i>via</i> NBS-promoted cyclization of unsaturated barbiturates and amidines
作者:Hui Xu、Rong-Lu Huang、Zhu Shu、Ran Hong、Ze Zhang
DOI:10.1039/d1ob00508a
日期:——
A selective cyclization of unsaturated barbiturates and amidines promoted by N-bromosuccinimide has been successfully developed to afford a vast variety of 5,4′-imidazolinyl spirobarbiturates in moderate to good yields. The present protocol features broad substrate scope, facile work-up procedure and mild reaction conditions, providing a novel strategy for the highly selective and efficient construction