Synthesis of Metal–Organic Frameworks MIL-101(Cr)-NH(2) Containing Phosphorous Acid Functional Groups: Application for the Synthesis of N-Amino-2-pyridone and Pyrano [2,3-c]pyrazole Derivatives via a Cooperative Vinylogous Anomeric-Based Oxidation

[Image: see text] In the current paper, we successfully developed and used metal–organic frameworks (MOFs) based on MIL-101(Cr)-NH(2) with phosphorus acid functional groups MIL-101(Cr)-N(CH(2)PO(3)H(2))(2). The synthesized metal–organic frameworks (MOFs) as a multi-functional heterogeneous and nanoporous catalyst were used for the synthesis of N-amino-2-pyridone and pyrano [2,3-c]pyrazole derivatives via reaction of ethyl cyanoacetate or ethyl acetoacetate, hydrazine hydrate, malononitrile, and various aldehydes. The final step of the reaction mechanism was preceded by a cooperative vinylogous anomeric-based oxidation. Recycle and reusability of the described catalyst MIL-101(Cr)-N(CH(2)PO(3)H(2))(2) were also investigated.