4-Chloro-3-(pyridin-2-yl)aniline → HCID 58614762, compound

HRID 923018Notes

Reaction equation

[Cl:1][C:2]1[CH:8]=[CH:7][C:5]([NH2:6])=[CH:4][C:3]=1[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][N:10]=1.[Cl:15][C:16]1[CH:24]=[C:23]([CH2:25][NH:26][CH2:27][C:28]([F:31])([F:30])[F:29])[CH:22]=[CH:21][C:17]=1[C:18](O)=[O:19]>>[Cl:15][C:16]1[CH:24]=[C:23]([CH2:25][NH:26][CH2:27][C:28]([F:29])([F:30])[F:31])[CH:22]=[CH:21][C:17]=1[C:18]([NH:6][C:5]1[CH:7]=[CH:8][C:2]([Cl:1])=[C:3]([C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][N:10]=2)[CH:4]=1)=[O:19]

Participants

Reactant 2

HCID 401519254-Chloro-3-(pyridin-2-yl)aniline

HCID 66878061HCID 66878061, compound

Product 1

HCID 58614762HCID 58614762, compound

Procedure

To 24.9 g of 2-chloro-4-(methoxycarbonyl)benzoic acid and 2 mL of Sulfuric Acid in 350 mL of DCM was added isobutylene gas at −78° C. until the solvent was saturated and capped off securely. Let go several days at room temperature and re-cool to −78° C. before removing cap. Concentrate solvent, extract with Ethyl Acetate and bicarbonate, dry with Magnesium Sulfate, filter and concentrate to give 31.4 g of 1-tert-butyl 4-methyl 2-chloroterephthalate. 3.35 g of 1-tert-butyl 4-methyl 2-chloroterephthalate was hydrolyzed via Procedure M. 2.5 g of 4-(tert-butoxycarbonyl)-3-chlorobenzoic acid was cooled to 0° C. in 25 mL of THF before a solution of 19.5 mL of 1M BH3-THF complex in THF was added dropwise. The ice bath was subsequently removed and the reaction was stirred at room temperature until reaction stalled out at ˜50% complete by TLC. The reaction is re-cooled to 0° C. and another 19.5 mL of BH3-THF is added dropwise before the ice bath is removed. Upon completion, the reaction is re-cooled to 0° C. and quenched with 3N HCl dropwise. The aqueous layer was extracted two times with Ethyl Acetate and the organic layer was then extracted once with bicarbonate solution and brine, dried over Magnesium Sulfate, filtered and concentrated to give tert-butyl 2-chloro-4-(hydroxymethyl)benzoate. 564 mg of tert-butyl 2-chloro-4-(hydroxymethyl)benzoate was cooled to 0° C. in 5 mL of DCM before adding 665 mg of Triphenylphosphine and 417 mg of NBS. Reaction was concentrated and directly purified via ISCO Combi-Flash to give pure tert-butyl 2-chloro-4-(hydroxymethyl)benzoate. 147 mg of tert-butyl 4-(bromomethyl)-2-chlorobenzoate was reacted with 2,2,2-trifluoroethanamine in DMSO via Procedure P. 141 mg of tert-butyl 2-chloro-4-((2,2,2-trifluoroethylamino)methyl)benzoate was treated with 4N HCl in Dioxane at 45° C. and concentrated to give 2-chloro-4-((2,2,2-trifluoroethylamino)methyl)benzoic acid. 50 mg of 4-chloro-3-(pyridin-2-yl)aniline was coupled to 75 mg of 2-chloro-4-((2,2,2-trifluoroethylamino)methyl)benzoic acid via Procedure G. The crude product was purified by reverse phase HPLC to give pure 2-chloro-N-(4-chloro-3-(pyridin-2-yl)phenyl)-4-((2,2,2-trifluoroethylamino)methyl)benzamide. MS (Q1) 454.6 (M)+.

Workup

customThe crude product was purified by reverse phase HPLC

Sources & evidence

ORD record: ord-29e62bdcf1174ec2b11cc0d27f6456b9
Source dataset: uspto-grants-2016_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09278961B2

Reaction notes

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