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 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.
Allence. Part 43. A novel synthesis of pyrimidines of potential pharmaceutical interest from allenic nitriles
作者:Stephen R. Landor、Phyllis D. Landor、V. E. Williams
DOI:10.1039/p19840002677
日期:——
The reactions of 4,4-dialkylbuta-2,3-dienenitriles and 3-phenylpropynenitrile with guanidine and acetamide have been investigated; a number of 6-alkyl-2,4-diaminopyrimidines and 6-alkyl-2-methyl-4-aminopyrimidines as well as 2,4-diamino-6-phenylpyrimidine and 4-amino-2-methyl-6-phenyl-pyrimidine have been synthesised.