A Facile Synthesis of New 2-Amino-4H-pyran-3-carbonitriles by a One-Pot Reaction of 𝜶,𝜶^′-Bis(arylidene) Cycloalkanones and Malononitrile in the Presence of K_𝟐CO_𝟑

Table 2

Comparison of results using K₂CO₃ with other catalyst for synthesis of 2-amino-4H-pyran-3-carbonitriles.

Entry	Catalyst	Solvent	T	Time	Yield (%)	Ref
1	NaOH/Piperidine	EtOH	MW	5–9 h	70-71	[17]
2	KF-Al2O3	DMF	R·T	10–14 h	68–90	[18]
3	HTMAB	H2O	110°C	8 h	76–93	[19]
4	K2CO3	EtOH	Reflux	5–60 min	75–95	This work