Diisopropylethylamine → N-(2-Amino-5-iodo-pyridin-3-yl)-3-[4-methyl-6-(trityl-amino)-pyridin-2-yl]-propionamide

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1.30 g of 3-[4-methyl-6-(trityl-amino)-pyridin-2-yl]-propionic acid acid and 724 mg of 2,3-diamino-5-iodo-pyridine are dissolved in 37 ml of pyridine and sequentially treated with 1.06 g of O-[(ethoxycarbonyl)canomethylene-amino]—N,N,N′,N′-tetramethyl-uronium tetrafluoro-borate and 579 μl of diisopropylethyl amine. The reaction mixture is warmed to 50° C. for 24 h. Thereafter the solvents are evaporated in vacuo. The remaining residue is coevaporated twice with toluene yielding 3.55 g of crude product. Purification by chromatography on LiChroprep® NH2 (25-40 μm, Merck, Darmstadt) (75 g, eluent: toluene/ethyl acetate 1:1) affords 1.08 g of the title compound as an amorphous solid. ESI-MS: 640.0 (MH+). TLC: Rf=0.16 (toluene/ethyl acetate 1:1, LiChroprep® NH2 HPTLC).

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