4-Methylmorpholine → HCID 67682294, compound

Participants

Reaction Steps

The mixture of (S)-tert-butyl 2-(5-(7-(2-((S)-pyrrolidin-2-yl)-1H-imidazol-5-yl)-5,10-dihydrochromeno[5,4,3-cde]chromen-2-yl)-1H-imidazol-2-yl)pyrrolidine-1-carboxylate and 2,7-bis(2-((S)-pyrrolidin-2-yl)-1H-imidazol-5-yl)-5,10-dihydrochromeno[5,4,3-cde]chromene obtained in the previous step was dissolved in dimethylformamide (6 mL). To this solution was added (S)-2-(methoxycarbonylamino)-3-methylbutanoic acid (194 mg, 1.11 mmol), HATU (309 mg, 0.81 mmol), and N-methylmorpholine (0.24 mL, 2.2 mmol). The reaction was stirred at room temperature for thirty minutes, and then quenched by the addition of formic acid (0.05 mL). The reaction was concentrated and the resulting residue was purified by preparative reverse phase HPLC (Gemini, 10 to 45% ACN/H2O+0.1% TFA) to yield methyl (S)-3-methyl-1-oxo-1-((S)-2-(5-(7-(2-((S)-pyrrolidin-2-yl)-1H-imidazol-5-yl)-5,10-dihydrochromeno[5,4,3-cde]chromen-2-yl)-1H-imidazol-2-yl)pyrrolidin-1-yl)butan-2-ylcarbamate (59 mg, 12%) as the tris-TFA salt. Also isolated from the reaction were (S)-tert-butyl 2-(5-(7-(2-((S)-1-((S)-2-(methoxycarbonylamino)-3-methylbutanoyl)pyrrolidin-2-yl)-1H-imidazol-5-yl)-5,10-dihydrochromeno[5,4,3-cde]chromen-2-yl)-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (124 mg, 23%) and dimethyl (2S,2′S)-1,1′-((2S,2′S)-2,2′-(5,5′-(5,10-dihydrochromeno-[5,4,3-cde]chromene-2,7-diyl)bis(1H-imidazole-5,2-diyl))bis(pyrrolidine-2,1-diyl))bis(3-methyl-1-oxobutane-2,1-diyl)dicarbamate (50 mg, 8%).

Provenance & Evidence