Synthesis of 2- and 4-imino(1,2-a)pyridopyrimidines from allenic nitriles and 2-aminopyridines
作者:Z.Tanee Fomum、J.Tanyi Mbafor、Phyllis D. Landor、Stephen R. Landor
DOI:10.1016/s0040-4039(01)82083-9
日期:1981.1
4,4-Dialkylallenyl nitriles and 2-aminopyridines give 2-alkyl-4-iminopyrido(1,2-a)pyrimidines as monohydrates in about 90% yield and 4-monoalkylallenyl nitriles similarly give 4-alkyl-2-imino(1,2-a)pyrimidines.
Allenes. Part XX. The preparation of 3-alkyl- and 3,3-dialkylallenenitriles
作者:P. M. Greaves、S. R. Landor、D. R. J. Laws
DOI:10.1039/j39680000291
日期:——
3-Alkyl- and 3,3-dialkylallenecarbonitriles are conveniently prepared in good yield from 1-alkyl and 1,1-dialkyl-3-bromoallenes by the action of cuprous cyanide in NN-dimethylformamide at 35–60° for 2 hours. Tertiary acetylenic alcohols may be directly converted into 3,3-dialkylallenecarbonitriles by stirring for 3 days with potassium cyanide, cuprous cyanide, and hydrobromic acid. The same mixture
Allenes. Part 39. The synthesis of 3-alkyl-5-aminopyrazoles and 3H-indoles from allenic or acetylenic nitriles
作者:Z. Tanee Fomum、Stephen R. Landor、Phyllis D. Landor、George W. P. Mpango
DOI:10.1039/p19810002997
日期:——
Hydrazine adds to allenic or acetylenic nitriles to give 3-alkyl-substituted 5-aminopyrazoles in excellent yields. Conjugated and unconjugated enaminic nitriles may be isolated from the Michael addition of phenylhydrazine to allenic nitriles and ring-closed to give 3-alkyl-5-amino-N-phenylpyrazoles and 3H-indoles.
Novel synthesis of imidazolines and imidazoles by Michael addition to allenic or acetylenic nitriles
作者:Zacharias T. Fomum、Phyllis D. Landor、Stephen R. Landor
DOI:10.1039/c3974000706a
日期:——
The synthesis of imidazolines and imidazoles by double Michael addition of ethylene- or phenylene-diamines to allenic or acetylenic nitriles is described; enaminicnitriles from α-amino-acids, -esters, and -nitriles did not give pyrrolone derivatives.
Allenes. Part XXVI. The synthesis of enaminic nitriles by the nucleophilic addition of amines to allenic nitriles
作者:Zacharias T. Fomum、Peter M. Greaves、Phyllis D. Landor、Stephen R. Landor
DOI:10.1039/p19730001108
日期:——
Unconjugated or conjugated enaminic nitriles may be obtained quantitatively by Michael addition of amines to 1-cyanoallenes, according to the reaction conditions. Both series of enamines are hydrolysed to β-keto-nitriles. I.r., u.v., and n.m.r. spectra are discussed.