1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → HCID 135481021, compound

Participants

Reaction Steps

To a solution of 3-(5-hydroxymethyl-1H-indol-2-yl)-1H-thieno[3,2-c]pyrazole-5-carboxylic acid [124 mg, 0.396 mmol, Example (37)] in dimethyl formamide (5 mL) is added 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (91 mg, 0.474 mmol) and 1-hydroxybenzotriazole (54 mg, 0.399 mmol). After stirring for 10 minutes, to it is added diisopropylethylamine (0.138 mL) and 1-(4-fluorophenyl)piperazine (79 mg, 0.438 mmol). The resulting yellow solution mixture is stirred at room temperature overnight. The reaction mixture is diluted in ethyl acetate (60 mL) and washed with water (3×10 mL), brine and dried over sodium sulfate. Purification by chromatography on silica gel (50% ethyl acetate/heptane then ethyl acetate) gave solid. The solid is redissolved in methanol and triturated with water to give [4-(4-fluoro-phenyl)-piperazin-1-yl]-[3-(5-hydroxymethyl-1H-indol-2-yl)-1H-thieno[3,2-c]pyrazol-5-yl]-methanone [110 mg, 56%, Example (38)] as cream solid, mp=156-158° C.; 1H NMR [(CD3)2SO)]: δ 13.490 (1H, s), 11.59 (1H, s), 7.563 (2H), 7.356 (1H), 7.109-6.985 (5H, m), 6.648 (1H), 5.004 (1H, t, OH), 4.553 (2H, d, OCH2), 3.856 (4H, br s), 3.208 (4H, br peak); LC/MS: 476 (M+H).

Provenance & Evidence