[Br:1][C:2]1[CH:7]=[CH:6][C:5]([OH:8])=[CH:4][C:3]=1[F:9].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[CH3:29][N:30]1[CH2:35][CH2:34][N:33]([CH2:36][CH2:37]O)[CH2:32][CH2:31]1.N(C(OC(C)C)=O)=NC(OC(C)C)=O>C(Cl)Cl>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([O:8][CH2:37][CH2:36][N:33]2[CH2:34][CH2:35][N:30]([CH3:29])[CH2:31][CH2:32]2)=[CH:4][C:3]=1[F:9]
A flask was charged with 4-bromo-3-fluorophenol (5.00 g, 26 mmol) and triphenylphosphine (10.30 g, 39 mmol). Methylene chloride (120 mL) was added followed by 2-(4-methylpiperazin-1-yl)ethanol (4.61 g, 32 mmol) and the solution was stirred on an ice water bath to cool. After 5 minutes, diisopropyl azodicarboxylate (7.6 ml, 39.1 mmol) was added over 6 to 8 minutes. The reaction was left stirring on the cold bath to slowly warm to room temperature overnight. The reaction was concentrated and the residue purified by flash chromatography (25% to 100% EtOAc in hexanes) to provide the product as a colorless oil (2.62 g, 33%).
Wird geladen…
