反应详情

温度

70 °C

To methyl 2-(bromomethyl)-5-chloro-4-nitrobenzoate (617 mg, 2 mmol) in methanol (18 mL) was added Et3N (0.34 mL, 2.4 mmol) and methylamine in EtOH (0.3 mL, ˜d 8 M in EtOH, 2.4 mmol). The mixture was heated to 70° C. for 3 h. and then EtOAc (30 mL) and 2M HCl(aq) (30 mL) was added. The layers were separated and the aqueous layer was extracted with EtOAc (2×30 mL). The combined organic fractions were passed through a hydrophobic frit and the solvent was removed in vacuo. Purification of the residue via silica gel column chromatography (0-10% methanol in DCM) gave 6-chloro-2-methyl-5-nitroisoindolin-1-one (347 mg, 77%) as an off-white solid. LCMS (10 cm_ESCI_Bicarb_MeCN): [M+H]+=227 at 2.89 min. 1H NMR (400 MHz, CDCl3): δ 8.00 (s, 1H), 7.90 (s, 1H), 4.46 (s, 2H), 3.24 (s, 3H).

1. customThe layers were separated
2. extractionthe aqueous layer was extracted with EtOAc (2×30 mL)
3. customthe solvent was removed in vacuo
4. customPurification of the residue via silica gel column chromatography (0-10% methanol in DCM)