Triethylamine → 3-[1-(4-carbamoyl-2-methylphenyl)-5-(4-[1,2,3]triazol-1-yl-phenyl)-1H-pyrrol-2-yl]-propionic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

Under a nitrogen atmosphere, 3-[5-(4-aminophenyl)-1-(4-carbamoyl-2-methylphenyl)-1H-pyrrol-2-yl]-propionic acid ethyl ester (11A, see Scheme 11) (103 mg, 0.26 mmol) was dissolved in methanol (5 mL). Triethylamine (0.07 mL, 0.48 mmol) was added. The mixture was cooled to 0° C. 2,2-dichloroacetaldehyde tosylhydrazone (15A) (62 mg, 0.22 mmol), dissolved in methanol (1.5 mL) was added slowly. The reaction was stirred at 0° C. for 5 min, and then heated to 40° C. for 3 hrs, then cooled to room temperature for 16 hrs. 2,2-dichloroacetaldehyde tosylhydrazone (15A) (62 mg) was added and stirred an additional 4 hr. The reaction was diluted with water (5 mL) and extracted with ethyl acetate. The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The crude material was purified by preparative TLC plate (1500 microns, 10% IPA/CH2Cl2). The desired band (RF=0.3) was isolated and dried under high vacuum to yield 3-[1-(4-carbamoyl-2-methylphenyl)-5-(4-[1,2,3]triazol-1-yl-phenyl)-1H-pyrrol-2-yl]-propionic acid ethyl ester (15B) (50 mg, 43%, light tan powder).

Provenance & Evidence