Methyl 4-(3-chloropropoxy)-5-methoxy-2-nitrobenzoate → Methyl 2-amino-4-(3-chloropropoxy)-5-methoxybenzoate

Temperature

40 °C

In a 50 mL volume glass flask equipped with a stirrer, a thermometer, a reflux condenser and a gas inlet were placed 2.02 g (6.58 mmol) of methyl 5-methoxy-4-(3-chloropropoxy)-2-nitrobenzoate (purity: 99%) obtained in Reference Example III-4 and 40 mL of methanol. The resulting mixture was heated to 40° C. under stirring. To the mixture was added 0.2 g of 5 wt. % palladium/carbon (containing 49% water) at the same temperature. The resulting mixture was heated to the same temperature for 2 hours, while hydrogen was introduced to the mixture under atmospheric pressure at a rate of 50 mL/min. After the reaction was complete, the reaction mixture was filtered and the filtrate was concentrated under reduced pressure, to precipitate a crystalline product. The crystalline product was dried under reduced pressure, to give 1.71 g (isolated yield: 98.1%, purity: 98% in terms of area percentage determined by high performance liquid chromatography) of methyl 5-methoxy-4-(3-chloropropoxy)anthranilate as a white crystalline product.

1. customIn a 50 mL volume glass flask equipped with a stirrer
2. additionwas introduced to the mixture under atmospheric pressure at a rate of 50 mL/min
3. filtrationthe reaction mixture was filtered
4. concentrationthe filtrate was concentrated under reduced pressure
5. customto precipitate a crystalline product
6. customThe crystalline product was dried under reduced pressure

ORD record

ord-5e8fbaf7c31042fe9cda3e035fbd3874

Source dataset

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08367824B2