252551-71-6Relevant articles and documents
A new pathway to 3-hetaryl-2-oxo-2H-chromenes: On the proposed mechanisms for the reaction of 3-carbamoyl-2-iminochromenes with dinucleophiles
Kovalenko, Sergiy M.,Bylov, Igor E.,Sytnik, Konstantyn M.,Chernykh, Valentyn P.,Bilokin, Yaroslav V.
, p. 1146 - 1165 (2007/10/03)
The present account summarizes the author's studies to elucidate the mechanisms of the recently reported rearrangements resulting from inter- and/or intramolecular reactions of 2-imino-2H-chromene-3-carboxamides with different dinucleophiles.
Recyclization of 2-imino-2H-1-benzopyrans by the action of nucleophilic reagents 4. Use of 2-(N-aroylhydrazono)coumarin-3-carboxamides for the synthesis of 3-(1,3,4-oxadiazol-2-YL)coumarins
Kovalenko,Sytnik,Nikitchenko,Rusanova,Chernykh,Porokhnyak
, p. 167 - 170 (2007/10/03)
A new method for the synthesis of 3-(1,3,4-oxadiazol-2-yl)coumarins is proposed. It is based on the recyclization of 2-(N-aroylhydrazono)coumarin-3-carboxamides, which are readily obtained by the reaction of 2-iminocoumarin-3-carboxamides with arenecarboxylic hydrazides in an acidic medium. Advantages of the given method over alternative synthetic schemes were shown. Proposals on the mechanism of reaction were made. 1999 KluwerAcademic/Plenum.