One-pot three-component synthesis of various xanthene derivatives catalysed by Fe₃O₄@NFC@NNSM-Mn(iii)^a.

Entry	Aldehyde	R 1	Product	Time (min)	Yieldb (%)	MP (°C)
						Found	Reported
1 (ref. 53)		H		10	98	203–204	203–205
2 (ref. 53)		H		15	95	229–230	228–230
3 (ref. 54)		H		15	92	205–206	206–207
4 (ref. 53)		H		10	95	259–261	260–261
5 (ref. 55)		H		10	97	205–206	205–206
6 (ref. 56)		Me		10	96	203–204	202–204
7 (ref. 57)		Me		10	95	169–170	168–170
8 (ref. 58)		Me		10	96	200–201	201–202
9 (ref. 59)		Me		20	93	295–297	>300
10 (ref. 60)		H		30	80	267–269	268–269
11 (ref. 61)		Me		25	85	155–157	—
12		H		15	90	168–170	New
13		Me		15	92	200–202	New
14		H		15	92	220–222	New
15		Me		20	95	250–252	New

^aReaction conditions: benzaldehyde (1.0 mmol), dimedone (2.0 mmol) and catalyst (0.5 mol%) and EtOH (3 ml), 45 °C.

^bIsolated yield.