Abstract
The development of efficient heterogeneous catalysts for one-pot tandem/cascade synthesis of imines remains meaningful and challenging. Herein, we constructed an Au/MOF catalyst featured hollow and double MOF shell nanostructure. Owing to its structural merits and acid-basic nature, the as-synthesized Void|(Au)ZIF-8|ZIF-8 catalyst exhibited an enhanced synergistically catalytic performance for tandem catalytic synthesis of imines from benzyl alcohol and aniline under air atmosphere and solvent-free condition. Its 170.16 h−1 of turnover frequency (TOF) was 2.5 times higher than that of the reported catalyst with the highest TOF value.
Highlights
Imines (Schiff bases) are widely presented in natural products, bioactive compounds and pharmaceutical structures (Kobayashi et al, 2011; Nielsen et al, 2011)
The key to improve the turnover frequency (TOF) value for heterogeneous tandem catalyzed synthesis of imine reactions lies in several factors
Au NPs were cleverly confined to the ZIF-8 pore channels by a solution impregnation-reduction strategy to obtain SPS|(Au)ZIF-8
Summary
Imines (Schiff bases) are widely presented in natural products, bioactive compounds and pharmaceutical structures (Kobayashi et al, 2011; Nielsen et al, 2011). We report an Au/MOF catalyst with hollow nanostructure featured double MOFs shells supported Au NPs (Void|(Au) ZIF-8|ZIF-8, Figure 1) as high selectivity heterogeneous catalyst for the one-pot tandem/cascade synthesis of imines.
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