New 3‐(pyridin‐6‐yl)pyrazolo[1,5‐a]pyrimidines were synthesized from (pyridin‐6‐yl)malonodinitrile 5a, ethyl (pyridin‐6‐yl)cyanoacetate 5b and (pyridin‐6‐yl)benzoylacetonitrile 5c. Compounds 5a‐c were obtained from the 4,4,4‐trichlorobut‐2‐enenitriles 2 and 1‐phenylethylidene)malonodinitrile (1).
The synthesis of a novel class of trichloro-1-(N-arylamino)ethylidene}malononitrile via a
copper-catalyzed multicomponent reaction of malononitrile-trichloroacetonitrile adduct and aryl halides
in good yields is described. The reported protocol has some advantages such as simple and mild
procedure, easy work-up, no column chromatography, available starting materials-catalyst, pure products
and good to high yields.
Studies on 3,5-Diaminopyrazoles: Synthesis of New Polyfunctionally Substituted Pyrazoloazines and Pyrazoloazoles
作者:Nadia S. Ibrahim、Kamal U. Sadek、Fatma A. Abdel-Al
DOI:10.1002/ardp.19873200310
日期:——
New aminopyrazolo[1,5‐a]pyrimidines, pyrazolo[3,4‐d]pyrimidines and imidazo[1,2‐b]pyrazoles were synthesised from ethyl 3,5‐diaminopyrazole‐4‐carboxylate (1).