1-Bromo-2-chlorobenzene → 2'-Chloro-2-fluoro-6-methoxybiphenyl

HRID 2116278Notes

Reaction equation

HRID 2116278 reaction equation
Br[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[Cl:8].[F:9][C:10]1[CH:15]=[CH:14][CH:13]=[C:12]([O:16][CH3:17])[C:11]=1B(O)O>>[CH3:17][O:16][C:12]1[C:11]([C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=2[Cl:8])=[C:10]([F:9])[CH:15]=[CH:14][CH:13]=1

Participants

3

Reactant 2

HCID 127541-Bromo-2-chlorobenzeneHCID 3294524(2-Fluoro-6-methoxyphenyl)boronic acid

Product 1

HCID 689614152'-Chloro-2-fluoro-6-methoxybiphenylYield 29%

Procedure

Treatment of 1-bromo-2-chlorobenzene (5.63 g, 29.4 mmol) with (2-fluoro-6-methyoxyphenyl)boronic acid (5.0 g, 29.42 mol) generally according to the procedure described for Intermediate 37 afforded 2.0 g (29%) of 6-fluoro-2′-chlorobiphenyl-2-yl methyl ether. Treatment of 6-fluoro-2′-chlorobiphenyl-2-yl methyl ether with hydrogen bromide (50 mL, 30 wt. % in acetic acid) generally according to the procedure described for Example 395 afforded a brown oil. The oil was reacted with sodium hydride (0.34 g, 14.35 mmol) and allyl bromide (1.74 g, 14.35 mmol) followed by refluxing the resultant allyl ether in mesitylene generally according to the procedure described for Intermediate 8 to provide 3-allyl-6-chloro-2′-chlorobiphenyl-2-ol. Treatment of 3-allyl-6-fluoro-2′-methylbiphenyl-2-ol (1.2 g, 4.56 mmol) with m-chloroperoxybenzoic acid (2.36 g, 13.68 mmol, 77%) and potassium carbonate (1.575 g, 11.4 mmol) generally according to the procedure described for Intermediate 9 afforded 0.7 g (55%) of (±)-[7-(2-chlorophenyl)-6-fluoro-2,3-dihydro-1-benzofuran-2-yl]methanol. Treatment (±)-[7-(2-chlorophenyl)-6-fluoro-2,3-dihydro-1-benzofuran-2-yl]methanol (1.5 g, 5.81 mmol) with p-toluenesulfonyl chloride (1.66 g, 8.71 mol) generally according to the procedure described for Intermediate 10 gave 0.9 g (82%) of (±)-[6-fluoro-7-(2-chlorophenyl)-2,3-dihydro-1-benzofuran-2-yl]methyl 4-methylbenzenesulfonate as a white solid. Treatment of (±)-[6-fluoro-7-(2-chlorophenyl)-2,3-dihydro-1-benzofuran-2-yl]methyl 4-methylbenzenesulfonate (0.50 g, 1.15 mmol) with sodium azide (0.4 g, 6.15 mmol) generally according to the procedure described for Intermediate 98 afforded 0.35 g, (99%) of (±)-2-(azidomethyl)-7-(2-chlorophenyl)-6-fluoro-2,3-dihydro-1-benzofuran. Treatment of (±)-2-(azidomethyl)-7-(2-chlorophenyl)-6-fluoro-2,3-dihydro-1-benzofuran (0.35 g, 1.15 mmol) in tetrahydrofuran (10 mL) with polymer-supported triphenylphosphine (0.60 g, 2.3 mmol) generally according to the procedure described for Example 154 provided 0.170 g (47%) of (±)-{[6-fluoro-7-(2-chlorophenyl)-2,3-dihydro-1-benzofuran-2-yl]methyl}amine as a white solid, hydrochloride salt. mp 248-250° C.

Sources & evidence

ORD record
ord-b5472c897e4e4e3f92b2c264348f1ff9
Source dataset
uspto-grants-2008_10
Patent number
US07435837B2

Reaction notes

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