Pd/PTABS: An Efficient Water-Soluble Catalytic System for the Amination of 6-Chloropurine Ribonucleoside and Synthesis of Alogliptin.

The synthesis and catalytic applications of the highly water-soluble ligand 7-phospha-1,3,5-triaza-admantane butane sultonate (PTABS) has been described. The synthesized PTABS ligand along with palladium acetate exhibits excellent reactivity towards the amination reaction of 6-chloro-9-(β-D-ribofuranosyl)-9H-purine at ambient temperature. This protocol offers an advantage over the previously published procedures for the amination of 6-chloropurine nucleoside furnishing 6-N-substituted adenosine analogues. The validation of the present strategy has been demonstrated via synthesis of a uracil-based, anti-diabetic drug alogliptin.