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
Sulfated tungstate catalyzed activation of nitriles: addition of amines to nitriles for synthesis of amidines
作者:Sachin D. Veer、Kamlesh V. Katkar、Krishnacharya G. Akamanchi
DOI:10.1016/j.tetlet.2016.07.073
日期:2016.9
the synthesis of amidines by direct nucleophilic addition of amines to nitriles using sulfated tungstate as heterogeneous catalyst is described. Highlight of the method is its applicability for the synthesis of amidines using a wide variety of amines including ammonia as ammonium acetate and nitriles. Catalyst is mildly acidic, stable, easy to prepare and separate from the reaction mass.
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.
A novel straightforward synthesis of 2,4,6-triaryl-1,3,5-triazines via copper-catalyzed cyclization of N-benzylbenzamidines