Reaction #91033

Reaction equation

HCl

methyl 4-chloro-3-methoxy-5-nitrobenzoate

Methyl 4-chloro-3-methoxy-5-nitrobenzoate

→

methyl 3-amino-4-chloro-5-methoxybenzoate

Yield 103.9%

Solvents

EtOH

water

Conditions

Workup

1. 1
   Otherdegassed with nitrogen for 20 min
2. 2
   workup.ADDITIONCelite (1 g) was added
3. 3
   workup.STIRRINGthe suspension stirred for 10 min
4. 4
   Filtrationthen filtered through a celite pad
5. 5
   OtherThe solvent was removed in vacuo
6. 6
   Otherthe residue was partitioned between EtOAc (15 mL) and water (15 mL)
7. 7
   OtherThe phases were separated
8. 8
   Washthe organic solution was washed with brine (2×15 mL)
9. 9
   OtherThe solvent was removed in vacuo

Procedure

A suspension of methyl 4-chloro-3-methoxy-5-nitrobenzoate (3) (900 mg, 3.66 mmol) and iron powder (614 mg, 11.0 mmol) in a mixture of EtOH (15 mL) and water (15 mL) was heated to 70° C. and degassed with nitrogen for 20 min. Conc. HCl (44.5 μL, 1.47 mmol) was added and the reaction mixture was stirred at 70° C. for 3 h. Celite (1 g) was added and the suspension stirred for 10 min then filtered through a celite pad. The solvent was removed in vacuo and the residue was partitioned between EtOAc (15 mL) and water (15 mL). The phases were separated and the organic solution was washed with brine (2×15 mL). The solvent was removed in vacuo to afford methyl 3-amino-4-chloro-5-methoxybenzoate (0.82 g, 100% yield) as a yellow solid: 1H NMR (400 MHz, DMSO-d6) δ: 7.10 (1H, d), 6.78 (1H, d), 5.68 (2H, s), 3.81 (6H, m).

Source