77746-63-5Relevant articles and documents
One-Pot Acid-Promoted Synthesis of 6-Aminopyrazolopyrimidines from 1 H-Pyrazol-5-yl- N, N-dimethylformamidines or 5-Amino-1 H-pyrazole-4-carbaldehydes with Cyanamide
Tseng, Ching-Chun,Tsai, Shuo-En,Li, Sin-Min,Wong, Fung Fuh
, p. 16157 - 16170 (2019/12/24)
A convenient and efficient one-pot acid-promoted synthesis of 6-aminopyrazolo[3,4-d]pyrimidine has been developed by treatment of 1H-pyrazol-5-yl-N,N-dimethylformamidines or 5-amino-1H-pyrazole-4-carbaldehydes with cyanamide (NH2CN) in an acid-
VILSMEIER-HAACK REACTION OF 5-AMINO- AND 5-ACYLAMINO-PYRAZOLES
Simay, A.,Takacs, K.,Horvath, K.,Dvortsak, P.
, p. 127 - 140 (2007/10/02)
The Vilsmeier-Haack reaction of 5-aminopyrazole derivatives 1 was investigated in view of contradictory literature reports.Structure 2 of the products was proved both chemically and spectroscopically.The mechanism of the reaction was postulated on the basis of isolated intermediates 7 and 8. 5-Acylaminopyrazoles 9, 10 and 11 were found to give also 2 (and 7) under the Vilsmeier conditions by an acyl splitting reaction, proceeding probably via diacylamino derivatives 12.Compounds 2 provided a simple route to pyrazolopyrimidine derivatives 13 and 14 as well as to azomethine compounds 15-18.