One-pot synthesis of tetrasubstituted pyrazoles—proof of regiochemistry
摘要:
1-Alkyl-5-amino-3-aryl-4-cyanopyrazoles, useful intermediates for fused heterocyclic systems, are synthesised by a one-pot three-step procedure from acid chlorides, malononitrile and alkylhydrazines, The regiochemistry of the hydrazine incorporation was proved in each case by X-ray crystallography and NMR spectroscopy.
One-pot synthesis of tetrasubstituted pyrazoles—proof of regiochemistry
摘要:
1-Alkyl-5-amino-3-aryl-4-cyanopyrazoles, useful intermediates for fused heterocyclic systems, are synthesised by a one-pot three-step procedure from acid chlorides, malononitrile and alkylhydrazines, The regiochemistry of the hydrazine incorporation was proved in each case by X-ray crystallography and NMR spectroscopy.