Trimethylsilyldiazomethane → Methyl 2-iodo-6-methylbenzoate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of 2-iodo-6-methylbenzoic acid (I57) (2.50 g, 9.54 mmol) in DCM (30 mL) and methanol (8 mL) under an atmosphere of nitrogen was cooled to 0° C. and trimethylsilyldiazomethane (2.0 M in diethyl ether, 9.54 mL, 19.1 mmol) was added dropwise. The reaction was stirred at 0° C. for 45 minutes and then quenched with 2 M aq. HCl (50 mL). DCM (150 mL) was added to the quenched reaction and the layers were separated. The aqueous layer was extracted with DCM (100 mL), the organics were combined and washed with sat. aq. NaHCO3 (100 mL), water (100 mL), brine (100 mL), dried (MgSO4), filtered and concentrated in vacuo to give a yellow oil. The crude product was purified by silica gel chromatography (Biotage Isolera, 40 g Si Cartridge, 0-20% EtOAc in petroleum benzine 40-60° C.) to give the title compound (I58) (2.00 g, 76% yield) as a colourless oil; 1H NMR (400 MHz, CDCl3) δ 7.65 (ddd, J=7.9, 1.0, 0.5 Hz, 1H), 7.19-7.15 (m, 1H), 6.99 (t, J=7.8 Hz, 1H), 3.95 (s, 3H), 2.33 (s, 3H). LCMS Method C: rt 6.08 min; m/z 277.0 [M+H]+.

Herkunft & Nachweise