4-Chlorobenzoyl chloride → (2-Chloro-4-methoxyphenyl)(4-chlorophenyl)methanone

Beteiligte Stoffe

Reaktionsschritte

To a stirred solution of 4-chlorobenzoyl chloride (1.0 g, 5.8 mmol) and 1-chloro-3-methoxybenzene(823.7 mmol) in CH2Cl2 (150 mL) at 0° C. was added AlCl3 (841.5 mg, 6.4 mmol). The reaction mixture was warmed to room temperature. After 12h the reaction mixture was poured into aq. NaHCO3 and extracted with CH2Cl2 (twice). The combined extracts were washed with brine, dried over Na2SO4, and concentrated in vaccuo to provide the crude product. Purification by silica gel chromatography provided (2-chloro-4-methoxyphenyl)(4-chlorophenyl)methanone(1.1 g, 4.1 mmol). (2-Chloro-4-methoxyphenyl)(4-chlorophenyl)methanone was dissolved in AcOH (60 mL) and 49% HBr (60 mL) was added. After 12h at 90° C. all volatiles were evaporated in vaccuo to afford (4-chlorophenyl)(2,4-dihydroxyphenyl)methanone in quantitative yield. This was dissolved in MeOH (30 mL) and THF (6 mL) and cooled to 0° C. Into the reaction mixture NaBH4 (235.5 mg, 6.2 mmol) was added. After 30 minutes the reaction was quenched with aq. NH4Cl and extracted with EtOAc. The combined extracts were washed with brine, dried over Na2SO4, and concentrated in vaccuo. Without purification this was subjected to alkylation with 1,8-dibromoocatane (3.3 g, 12.3 mmol) and K2CO3 (1.7 g, 12.3 mmol) in DMF (45 mL). After 12h the reaction mixture was diluted with water (150 mL) and water phase was extracted with EtOAc (twice). The combined organic phase was washed with brine, dried over Na2SO4, and concentrated in vaccuo to give the crude product. Purification by silica gel chromatography provided (4-(8-bromooctyloxy)-2-chlorophenyl)(4-chlorophenyl)methanol (1.6 g, 3.5 mmol). To a stirred solution of (4-(8-bromooctyloxy)-2-chlorophenyl)(4-chlorophenyl)methanol (1.6 g, 3.5 mmol) in THF (25 mL) was added N-methylprop-2-en-1-amine (746 mg, 10.5 mmol) and NaHCO3 (11.0 mmol). After 36h at room temperature the reaction mixture was filtered through a glass-filter. The filtrate was evaporated in vaccuo. Purification by silica gel chromatography provided (4-(8-(allyl(methyl)amino)octyloxy)-2-chlorophenyl)(4-chlorophenyl)methanol (1.5 g, 3.3 mmol); 1H-NMR (300 MHz, CDCl3); 7.29-7.17 ppm (m, 5H), 6.84 (d, J=10.1 Hz, 1H), 6.74 (s, 1H), 5.98-5.80 (m, 2H), 5.31-5.15 (m, 2H), 3.85 (t, J=7.6 Hz, 2H), 3.20-3.08 (m, 2H), 2.58-2.40 (m, 2H), 2.35 (s, 3H), 1.77-1.45 (m, 4H), 1.32-1.15 (m, 8H); 13C—NMR (75 MHz, CDCl3) 156.3 ppm, 138.3, 134.2, 131.8, 130.0, 129.6, 129.3, 116.2, 74.5, 68.8, 60.4, 43.8, 57.0, 29.6, 29.3, 28.1, 27.3, 25.9; ESI-MS calcd for C25H34Cl2NO2 [M+H]+: 450.2. found 450.2.

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