The study results on the effect of various solvents on the A³-coupling preparation of propargylamine^a.

Entry	Solvent	Base	Temp. (°C)	Cat. (mol%)	Time (h)	Yieldb (%)
1	CH3CN	KOH	60	0.05	10	75
2	CH3CN	KOH	60	0.1	10	75
3	EtOH	KOH	80	0.05	10	45
4	EG	KOH	100	0.05	10	61
5	CHCl3	K2CO3	60	0.1	10	92
6	CHCl3	Cs2CO3	60	0.1	10	96
7	CHCl3	KOH	60	0.1	10	87
9	CHCl3	NaOH	60	0.1	10	84
10	CHCl3	Et3N	60	0.1	10	76

^aReaction conditions: 1.2 mmol of morpholine, 1 mmol of benzaldehyde, and 1.3 mmol of phenylacetylene.

^bIsolated yields.