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Referring to FIG. 20, triethylamine (1.879 mL, 13.49 mmol) was added to a solution of 5c (0.2612 g, 1.349 mmol) in THF (20 mL) under a nitrogen atmosphere. Chloromethyl methyl ether (0.241 mL, 3.17 mmol) was added to the mixture dropwise. After stirring for 2 h, the solution was diluted with EtOAc and washed successively with water (×2) and brine. The organic layer was dried over MgSO4, filtered, and evaporated. The resulting residue was purified by flash chromatography (3:7 EtOAc/hexane) to afford 8c (0.2298 g, 0.9668 mmol, 72%) as a yellow solid (mp 78-79° C.): 1H NMR (CDCl3) δ 8.01 (1H, d, J=8.8 Hz), 7.67 (1H, d, J=8.8 Hz), 7.47 (1H, d, J=9.2 Hz), 7.26 (1H, d, J=8.8 Hz), 5.40 (2H, s), 3.58 (3H, s), 2.82 (3H, s); 13C NMR (CDCl3) δ 160.9, 153.8, 145.4, 136.6, 126.9, 123.5, 121.4, 116.7, 105.0, 95.7, 56.8, 26.0; FTIR (neat) 2919, 1611, 1508, 1259, 1011, 833, 783 cm−1; MS (ESI) m/z calculated for (C12H12ClNO2+H)+ 238 (35Cl) and 240 (37Cl), found 238 (35Cl) and 240 (37Cl); HRMS (ESI) m/z calculated for (C12H12ClNO2+H)+ 238.0635 (35Cl) and 240.0605 (37Cl), found 238.0623 (35Cl) and 240.0593 (37Cl).

1. washwashed successively with water (×2) and brine
2. dry with materialThe organic layer was dried over MgSO4
3. filtrationfiltered
4. customevaporated
5. customThe resulting residue was purified by flash chromatography (3:7 EtOAc/hexane)