Nucleoside Azide-Alkyne Cycloaddition Reactions Under Solvothermal Conditions or Using Copper Vials in a Ball Mill

作者：Cummings Andrew J; Ravalico Francesco; McColgan Bannon Kegan I S; Eguaogie Olga; Elliott P Alain; Shannon Matthew R; Bermejo Iris A; Dwyer Angus; Maginty Amanda B; Mack James; Vyle Joseph S^*

来源：Nucleosides Nucleotides & Nucleic Acids, 2015, 34(5): 361-370.

DOI：10.1080/15257770.2014.1001855

• Synthetic methodology
• modified nucleosides
• green chemistry

Novel nucleoside analogues containing photoswitchable moieties were prepared using 'click' cycloaddition reactions between 5 '-azido-5 '-deoxythymidine and mono- or bis-N-propargylamide-substituted azobenzenes. In solution, high to quantitative yields were achieved using 5mol% Cu(I) in the presence of a stabilizing ligand. 'Click' reactions using the monopropargylamides were also effected in the absence of added cuprous salts by the application of liquid assisted grinding (LAG) in metallic copper reaction vials. Specifically, high speed vibration ball milling (HSVBM) using a 3/32('') (2.38mm) diameter copper ball (62mg) at 60Hz overnight in the presence of ethyl acetate lead to complete consumption of the 5 '-azido nucleoside with clean conversion to the corresponding 1,3-triazole.

• 出版日期2015-5-4