How can I prepare sulphonamide-isatin imine without using a metal catalyst?

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Alaa J Mahrath

Dear Suresh : what exactly you want to do? In Imine preparation you need as catalyst just glacial acetic acid.

Pavel Pazdera

For inspiration see:

https://www.researchgate.net/publication/265959505_Synergism_of_Metal_and_Organocatalysis_in_Condensation_Reactions_of_Aromatic_Aldehydes_with_Anilines_Affording_Imines_Effect_of_Catalysts_on_the_Base_of_a_Supported_Cerium%28III%29_and_Proline

Article Synergism of Metal and Organocatalysis in Condensation React...