3-Azidopropan-1-amine → (14S,18S)-tri-tert-butyl 2-(4-((1-(3-aminopropyl)-1H-1,2,3-triazol-4-yl)methoxy)benzyl)-1-(1-(2-(tert-butoxy)-2-oxoethyl)-1H-imidazol-2-yl)-8,16-dioxo-2,9,15,17-tetraazaicosane-14,18,20-tricarboxylate

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Reaction Steps

To a solution of (14S,18S)-tri-tert-butyl 1-(1-(2-(tert-butoxy)-2-oxoethyl)-1H-imidazol-2-yl)-8,16-dioxo-2-(4-(prop-2-yn-1-yloxy)benzyl)-2,9,15,17-tetraazaicosane-14,18,20-tricarboxylate (250 mg, 0.266 mmol) and 3-azidopropan-1-amine (200 mg, 2.0 mmol) in THF (5.0 mL) and water (1.0 mL) was added copper powder (17 mg) and 1 N CuSO4 (0.05 mL). The mixture was stirred at room temperature for 6 hrs under nitrogen, diluted with DCM, washed with aqueous saturated solution of EDTA. The solvent was evaporated under reduce pressure to afford a residue, which was purified by Biotage SP4 to afford (14S,18S)-tri-tert-butyl 2-(4-((1-(3-aminopropyl)-1H-1,2,3-triazol-4-yl)methoxy)benzyl)-1-(1-(2-(tert-butoxy)-2-oxoethyl)-1H-imidazol-2-yl)-8,16-dioxo-2,9,15,17-tetraazaicosane-14,18,20-tricarboxylate (158 mg, 57%) as a yellow oil. MS (ESI), 520.4 (M/2+H)+.

Provenance & Evidence