3-(2-Nitro-benzoylamino)-thieno[2,3-c]pyrazole-1,5-dicarboxylic Acid 5-tert-butyl Ester 1-ethyl Ester → 3-(2-Nitro-benzoylamino)-thieno[2,3-c]pyrazole-1,5-dicarboxylic Acid 1-ethyl Ester

Beteiligte Stoffe

Reaktionsschritte

To a solution of 5.380 g of 3-(2-Nitro-benzoylamino)-thieno[2,3-c]pyrazole-1,5-dicarboxylic acid 5-tert-butyl ester 1-ethyl ester in 25 mL of dichloromethane TFA (25 mL) is slowly added at room temperature. After stirring for 1 hour the reaction mixture is dried up. The colourless solid is taken up with ethyl ether and filtered affording 4.052 g (86%) of the titled compound.

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