Hydrochloric Acid → 2-Chloro-N-cyclopropyl-5-(3-methoxy-propenyl)-benzamide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

5-Bromo-2-chloro-N-cyclopropyl-benzamide (19.3 g, 70.5 mmol) was dissolved in a mixture of DMF (350 mL) and 1-propanol (210 mL). Pd(OAc)2(PPh3)3 (2.64 g, 3.53 mmol) was added. (E)-2-(3-Methoxypropenyl)4,4,5,5-tetramethyl-1,3,2-dioxaborolane (15 mL, 70.5 mmol) was added through a syringe, and aq. 2M Na2CO3 (123 mL) was added. The mixture was stirred at 80° C. for 2 h, and allowed to cool to rt. Aq. 10% HCl was added carefully until a pH of 2 was reached. The solvents were partially removed under reduced pressure, and the residue was extracted with Et2O (3×). The combined org. extracts were washed with water and brine, dried over MgSO4, filtered, and the solvents were removed under reduced pressure. Purification of the residue by FC (EtOAc/heptane 1:2→1:1→EtOAc) yielded the title compound (12.7 g, 68%). LC-MS: tR=0.82 min; ES+: 266.17.

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