Convenient approaches to synthesis of furanoid sugar-aza-crown ethers from C-ribosyl azido aldehyde via a reductive amination/amidation

A short and highly efficient route to the α-anomer of a furanoid sugar-aza-crown ether was developed by a one-pot reductive amination of an α-anomer C-ribosyl azido aldehyde. In addition, the β-anomer furanoid sugar-aza-crown ether was synthesized from a linear disaccharide precursor via amidation and then followed by microwave-assisted amide reduction.