Dimethylformamide → 9-Bromo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid (2-hydroxy-ethyl)-isopropyl-amide

Participants

Reaction Steps

9-Bromo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid (2.4 g, 7.4 mmol) was dissolved in N,N-Dimethylformamide (DMF, 50 mL, 600 mmol). Added N,N,N′N′-Tetramethyl-O-(7-azabenzotriazol-1-yl)uranium Hexafluorophosphate (3.1 g, 8.1 mmol) and N,N-Diisopropylethylamine (6.4 mL, 37 mmol) and let stir for 10 minutes. Added 2-(isopropylamino)ethanol (1.5 g, 15 mmol) and let the reaction stir for 2 hours. More N,N,N′N′-Tetramethyl-O-(7-azabenzotriazol-1-yl)uranium Hexafluorophosphate was added to the reaction (2.8 g, 7.4 mmol) and let the reaction stir for another 3 hours. Reaction was complete by LCMS. Concentrated in vacuo and flash purified on the ISCO 0 to 50% ethyl acetate in hexanes two times to give 9-Bromo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid (2-hydroxy-ethyl)-isopropyl-amide (2.05 g, 68% yield).

Provenance & Evidence