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The difficult coupling of α-aminoisobutyric acid (Aib), during the synthesis of dipeptides (1-6), was carried out using PyBOP/HOBt and HBTU/HOBt reagents by application of microwave energy in the presence of solvent. Room temperature, conventional heating (oil bath) and microwave irradiation of the reactions are compared. Synthesis by microwave irradiation gave the desired compounds in higher yields...
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