Supramolecular aminocatalysis via inclusion complex: Amino-doped β-cyclodextrin as an efficient supramolecular catalyst for the synthesis of chromeno pyrimido[1,2-b]indazol in water

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>Well-modified amino-appended β-cyclodextrin (AA-β-CD) with an amino group at the primary face of the β-CD was synthesized and used in the catalytic synthesis of chromeno pyrimido[1,2-b]indazol as supramolecular catalysts in water for the first time. AA-β-CD was characterized by FT-IR, NMR, MALDI-TOF mass spectrometry, and SEM analysis. A possible reaction mechanism featuring molecular complexation was suggested based on 2D NMR (ROESY) spectroscopy, FE-SEM, DSC, and FT-IR. Advantages such as operational simplicity, recyclability of the catalysts, and accessibility in aqueous medium render this protocol eco-friendly.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Amino-appended β-cyclodextrin (AA-β-CD) as a supramolecular organic base catalyst were synthesized. </LI> <LI> AA-β-CD catalyzed the synthesis of chromeno pyrimido[1,2-b]indazol derivatives. </LI> <LI> AA-β-CD as a catalyst can be easily recovered and reused. </LI> <LI> Reaction mechanism was elucidated extensively by spectroscopic analysis. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>