Pyridine → 3a,4,7,7a-tetrahydro-2-(((trifluoromethyl)sulfonyl)oxy)-4,7-methano-1H-isoindole-1,3(2H)-dione

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To a solution of trifluoromethanesulfonic anhydride (6.5 g, 23 mmole) in methylene chloride (20 ml), a solution of N-hydroxy-bicyclo[2,2,1]-hept-5-ene-2,3-dicarboximide (3.6 g, 20 mmole) and pyridine (1.6 g) in methylene chloride (10 ml) was added dropwise at 0°-5° C. and continued to stir for 15 minutes at the same temperature. The reaction mixture was washed with H2O (20 ml×3), dried over anhydrous Mg SO4 and evaporated. The residue was recrystallized from ethanol to give 6.1 g of N-trifluoromethanesulfonyloxy-bicyclo[2,2,1]-hept-5-ene-2,3-dicarboximide as white needles. m.p. 89°-90° C.

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