Scientific Reports

Table 2 synthesis of triazolo[1,2-a]indazole-trione and spiro triazolo[1,2-a]indazole-tetraones ^a.

From: Three component synthesis of triazolo[1,2-a]indazole-trione and spiro triazolo[1,2-a]indazole-tetraones using GO/SiO₂/Co (II)


Entry	product	Time (min)	Yield^b(%)	M.P. /M.P. (^oC)^c
1		10	91	194–197/195–197⁴³
2		14	96	177–178/171–173¹⁰
3		18	97	187–189/190–192¹⁰
4		11	97	131–132/131–33⁴³
5		12	97	163–165/166–168⁴⁴
6		19	93	295–298
7		12	94	230–232/298–300¹²
8		12	94	293–294/292–293¹²

^areaction conditions: dimedone, 4-Phenyl urazole, aryl aldehydes or isatin derivatives under solvent-free conditions, 90 °C. ^bisolated yields. ^cLiterature references.

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