Hydrochloric Acid → HCID 11392836, compound

To a solution of 6-hydroxymethyl-benzo[b]thiophene-2-carboxylic acid ethyl ester (103 mg, 0.44 mmol) at rt was added NaH (60% dispersion, 54 mg, 1.35 mmol). The resulting mixture was allowed to stir at rt for 15 min and benzyl bromide (60 μL, 0.50 mmol) was added. After stirring at rt for additional 30 min, the mixture was poured into a mixture of 1N HCl (3 mL) and H20 (30 mL) and the solution was extracted with EtOAc (30 mL). The organic layer was washed with 20 ml of brine and dried over Na2SO4. After filtration, the filtrate was concentrated and dried under high vacuum, the residue was dissolved in anhydrous MeOH (7 mL) and hydroxylamine hydrochloride (116 mg, 1.67 mmol) was added, followed by the addition of NaOMe solution (4.37 M in MeOH, 0.74 mL, 3.2 mmol). The mixture was allowed to stir at rt till the reaction was complete. The reaction mixture was concentrated and the residue was dissolved in 4 mL of water. The obtained solution was acidified with 2N HCl to pH≈8. The solid formed was filtered, washed with water and dried to give 6-benzyloxymethyl-benzo[b]thiophene-2-carboxylic acid hydroxyamide as a light orange solid. 1H NMR (DMSO-d6, 200 MHz) δ 7.96 (s, 1H), 7.92-7.81 (m, 2H), 7.42-7.20 (m, 6H), 4.64 (s, 2H), 4.55 (s, 2H). MS (EI): cal'd 314.1 (MH+), exp 314.1 (MH+).

1. stirringAfter stirring at rt for additional 30 min
2. extractionthe solution was extracted with EtOAc (30 mL)
3. washThe organic layer was washed with 20 ml of brine
4. dry with materialdried over Na2SO4
5. filtrationAfter filtration
6. concentrationthe filtrate was concentrated
7. customdried under high vacuum
8. dissolutionthe residue was dissolved in anhydrous MeOH (7 mL)
9. stirringto stir at rt till the reaction
10. concentrationThe reaction mixture was concentrated
11. dissolutionthe residue was dissolved in 4 mL of water
12. customThe solid formed
13. filtrationwas filtered
14. washwashed with water
15. customdried

ORD record

ord-52b2b8d84c444fe287e83107d29658f3

Source dataset

uspto-grants-2011_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07935724B2