Zn(Proline)2-catalyzed Knoevenagel condensation under solvent-free/aqueous conditions and biological evaluation of products
作者:Zeba N. Siddiqui、T. N. Mohammed Musthafa、Shagufta Praveen、Farheen Farooq
DOI:10.1007/s00044-010-9376-4
日期:2011.12
A novel approach was adopted for the synthesis of series of Knoevenagel condensation products from 5-chloro-3-methyl-1-phenylpyrazole-4-carboxaldehyde with different cyclic active methylene compounds, using water soluble and recyclable Zn(Proline)(2) as a Lewis acid catalyst both under solvent-free condition and using water as a reaction medium in good yields. In each conversion, the catalyst was successfully recovered and recycled without significant loss in yield and selectivity. The compounds were screened for their antimicrobial activity.