A Facile One-Pot Solvent-Free Synthesis of 1,2-Dihydro-1-arylnaphtho[1,2-e][1,3]oxazine-3-ones Catalyzed by Wet Cyanuric Chloride

Table 3

Comparison of efficiency of various catalysts in synthesis of 1,2-dihydro-1-phenylnaphtho[1,2-e][1,3]oxazin-3-one.

Entry	Condition	T°C	Time/min.	Yield%	Reference
1	Montmorillonite K10 clay/neat	160	30	89	[5]
2	HClO4/SiO2/neat	150	60	85	[1]
3	Phosphomolybdic acid/DMF	100	180	87	[6]
4	I2 /Hot plate	80	5	96	[2]
5	P-TSA^a/neat	160	90	58	[3]
6	[bmim]Br/P-TSA	160	180	76	[7]
7	Nano Cu/PEG-400	rt	45	93	[4]
8	TCT	150	12	87	This work

^ap-Toluenesulfonic acid.