Triethyl methanetricarboxylate → 2-hydroxy-4-oxo-7-(5-trifluoromethyl-pyridin-2-yl)-5,6,7,8-tetrahydro-4H-9-thia-1,4a,7-triaza-fluorene-3-carboxylic acid ethyl ester

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The mixture of 5-(5-trifluoromethyl-pyridin-2-yl)-4,5,6,7-tetrahydro-thiazolo[5,4-c]pyridin-2-ylamine (5.7 gm, 0.019 mol) and triethyl methantricarboxylate (16.1 ml, 0.076 mol) in xylene (100 ml) was heated at 140-150° C. for 6 hours. Xylene was evaporated and diethyl ether was then added and the suspension was stirred for 15 minutes. It was filtered and washed with ether. The crude solid was digested with dichloromethane (200 ml) and filtered to remove insoluble residue. Dichloromethane layer was distilled off under vacuum to give 1.3 gm of title compound.

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