Reaction of styrene episulfide with phenylacetylene and sodium azide catalysed by Fe₃O₄@SiO₂–PMA–Cu under different conditions.

Entry	Amount of catalyst (mg)	Solvent	Temperature (°C)	Time (min)	Yieldab (%)
1	—	EtOH	Reflux	10	0
2	2	EtOH	Reflux	15	43
3	3	EtOH	Reflux	15	75
4	5	EtOH	Reflux	15	81
5	8	EtOH	Reflux	15	94
6	10	EtOH	Reflux	15	98
7	12	EtOH	Reflux	15	100
8	15	EtOH	Reflux	15	100
9	12	MeOH	Reflux	15	95
10	12	H2O	80	15	93
11	12	CH3CN	Reflux	15	81
12	12	DMF	80	15	67
13	12	EtOAc	Reflux	15	73
14	12	THF	Reflux	15	Trace
15	12	n-Hexane	Reflux	15	28
16	12	CCl4	Reflux	15	17
17	12	Solvent free	80	15	Trace
18	12	EtOH	25	15	Trace
19	12	EtOH	40	15	57
20	12	EtOH	60	15	76
21	12	EtOH	65	15	84
22	12	EtOH	70	15	93

^aReaction conditions: phenylacetylene (1 mmol), episulfide (1 mmol) and sodium azide (1.3 mmol) catalyst (mg) and solvent (10 mL).

^bIsolated yields.