Diisopropylethylamine → 4-[3-({3-[1-(3-tert-Butoxycarbonylamino-propyl)-piperidin-4-yl]-2-oxo-2,9-dihydro-3H-10-oxa-1,3,9-triaza-anthracene-7-carbonyl}-amino)-propyl]-piperazine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

A solution of 3-[1-(3-tert-Butoxycarbonylamino-propyl)-piperidin-4-yl]-2-oxo-2,9-dihydro-3H-10-oxa-1,3,9-triaza-anthracene-7-carboxylic acid (6) (150 mg, 0.31 mmol, 1 equiv) and 4-(3-Amino-propyl)-piperazine-1-carboxylic acid tert-butyl ester (150 mg, 0.62 mmol, 2.0 equiv) in DMF (5 mL) was treated with HATU(235 mg, 0.62 mmol, 2.0 equiv) and Hunig's base. The resulting solution was stirred at RT for 6 h. When TLC and LCMS showed the reaction was complete, the reaction solution was concentrated in vacuo, and the residue was directly purified by column chromatography (SiO2, 0-10% MeOH/CH2Cl2 gradient elution) to afford the desired 4-[3-({3-[1-(3-tert-Butoxycarbonylamino-propyl)-piperidin-4-yl]-2-oxo-2,9-dihydro-3H-10-oxa-1,3,9-triaza-anthracene-7-carbonyl}-amino)-propyl]-piperazine-1-carboxylic acid tert-butyl ester (106 mg, 220 mg, theoretical, 48%), which was treated with 4M HCl in dioxane to afford the final product 3-[1-(3-Amino-propyl)-piperidin-4-yl]-2-oxo-2,9-dihydro-3H-10-oxa-1,3,9-triaza-anthracene-7-carboxylic acid (3-piperazin-1-yl-propyl)-amide (8). For 7: C36H54N8O7, LCMS (EI) m/e 711(M++H). For 8: C26H38N8O3, LCMS (EI) m/e 511(M++H).

Provenance & Evidence