Abstract
A series of alkyl 6′-amino-5′-cyano-2-oxo-1′H-spiro[indoline-3,4′-pyrano[2,3-c]pyrazole]-3′-carboxylates has been synthesised in the presence of sodium chloride as catalyst in water. The green synthesis shows attractive green characteristics such as, using water as the reaction medium, very short reaction time, easy work up, and reduced waste.
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