versatile synthetic methodology for the construction of tetrazoles and guanidines in the presence of an eco-friendly, inexpensive, easily available iron reagent. Aromatic thioureas with electron-donating substituents produced their respective target products in quantitative yield. In contrast, when electron-withdrawing substituted aromatic thioureas were used, the expected products were obtained in reduced
One-Pot Two-Step Solvent-Free Rapid and Clean Synthesis of 2-(Substituted Amino)pyrimidines by Microwave Irradiation
作者:Shyamaprosad Goswami、Anita Hazra、Subrata Jana
DOI:10.1246/bcsj.82.1175
日期:2009.9.15
A series of diversely 2-(substitutedamino)pyrimidines (along with ring substitution) has been synthesized under solvent- and catalyst-free microwave conditions from substituted guanidines and β-di...
在无溶剂和无催化剂微波条件下,由取代胍和 β-二...
Sur la substitution des alcoyl- et arylguanidines par des restes acides
作者:Eric Junod
DOI:10.1002/hlca.19520350343
日期:1952.5.2
1. Lasubstitutiondes guanidines alcoylées ou arylées par le chloroformiate de méthyle (effectuée dans l'acétone en présence de NaOH aq. conc.) est totale chez celles qui portent jusqu'à 3 atomes d'hydrogène, à l'exception de la diphénylguanidine asym. – Les nitro-, mono- et dialcoyl-nitro- et monoaryl-cyanoguanidines ont été dicarbométhoxylées. La dicyandiamide elle-même n'est pas acylée dans les
A convenient one-step transformation of primary and secondary amines into the corresponding unprotected guanidines using 4-benzyl-3,5-dimethyl-1H-pyrazole-1-carboxamidine and its polymer-bound variant is described. The scopes and limitations of the method, the microwave-assistance of amidination as well as a recycling protocol are examined.
Newreagents for the high yielding amidination of primary and secondary amines are described. By attaching a benzyl substituent to the 3,5-dimethyl-1H-pyrazole-1-carboxamidine ring, a reagent 1 is obtained which allows easy work-up after amidination because of solubility of byproducts in organic solvents. In addition, the polystyrene-bound analogue 2 was prepared which allows amidination of various