KO<sup>t</sup>Bu-promoted synthesis of multi-substituted 4-aminopyrimidines from benzonitriles and aliphatic amides
作者:Jian-Bo Feng、Xiao-Feng Wu
DOI:10.1039/c5ra24292d
日期:——
Multi-substituted 4-aminopyrimidines were prepared from commercially-available benzonitriles and aliphatic amides in transition-metal-free conditions. With KOtBu as the only promoter, target pyrimidines were isolated in moderate to excellent yields.
with a variety of electron-deficient dienophiles to yield pyridine or pyrimidinederivatives. The stereochemistry of the hetero Diels-Alder reaction in the cases of dimethyl fumarate and acrylonitrile has been assigned by X-ray diffraction analyses of the resulting tetrahydropyridines and corresponds to an exo selectivity. The number and nature of cycloadducts in the cases of dimethyl acetylenedicarboxylate
Orthoamide, LXV [1]. Kondensationsreaktionen von Amidinen, Guanidinen, Hydrazin und Hydrazin-Derivaten mit Orthoamiden von Alkincarbonsäuren / Orthoamides,LXV [1]. Condensation Reactions of Amidines, Guanidines, Hydrazine and Hydrazine Derivatives with Orthoamides of Alkyne Carboxylic Acids
The orthoamide derivatives 4 react with amidines 10 and guanidines 11 to give 4-dimethylaminopyrimidines 12. The 3-dimethylamino-pyrazoles 13a - c can be prepared from orthoamides 4 and hydrazine. The hydrazine derivative 14, whose constitution was established by crystal structure analysis, is obtained in low yield when hydrazine is added dropwise to a boiling solution of 4d in THF. Methyl- and phenylhydrazine