GT reaction of ethyl cyanoacetate, (NH₄)₂CO₃, and 1,3-dicarbonyls^a.

Entry	R	R1	Product	Time (h)	Isolated yield (%)
1	CH3	OEt		4	96
2	CH3	OMe		3.5	98
3	CH3	O-tBu		8	85
4	Ph	OEt		7	93
5	CF3	OEt		2.5	95
6	CH2Cl	OEt		9	90
7	n-Propyl	OEt		7	85
8	Me	Me		5	90
9	Me	Ph		4	87
10	CF3			4	84
11	CF3	Me		3	90

^aReaction conditions: ethyl cyanoacetate (1 mmol), 1,3-dicarbonyl (1 mmol), (NH₄)₂CO₃ (2 mmol), H₂O : EtOH (1 : 1), 80 °C.