Methanol → Methyl 5-chloro-2-methyl-3-nitrobenzoate

HRID 907968노트

반응식

HRID 907968 반응식
[Cl:1][C:2]1[CH:3]=[C:4]([N+:12]([O-:14])=[O:13])[C:5]([CH3:11])=[C:6]([CH:10]=1)[C:7]([OH:9])=[O:8].OS(O)(=O)=O.[CH3:20]O>>[Cl:1][C:2]1[CH:3]=[C:4]([N+:12]([O-:14])=[O:13])[C:5]([CH3:11])=[C:6]([CH:10]=1)[C:7]([O:9][CH3:20])=[O:8]

참가 물질

4

반응물 3

HCID 887MethanolHCID 1118Sulfuric AcidHCID 230097625-Chloro-2-methyl-3-nitrobenzoic acid

생성물 1

HCID 53399191Methyl 5-chloro-2-methyl-3-nitrobenzoate수율 35%

실험 절차

A solution of crude 5-chloro-2-methyl-3-nitrobenzoic acid (13.2 g) in dry methanol (100 mL) was cooled to 0° C. (3 mL) was added conc. H2SO4 dropwise. After the addition, the mixture was heated to reflux for 16 hr. After removal of solvents under reduced pressure, the crude product was purified by silica gel chromatography (petroleum ether to petroleum ether/EtOAc=50:1) to give the title compound (6.3 g, yield 35% for two steps) as a white solid. LC-MS (ESI) m/z: 230 (M+1)+, 231 (M+2)+. 1H-NMR (400 MHz, CDCl3) δ (ppm): 2.59 (s, 3H), 3.95 (s, 3H), 7.84-7.85 (d, 1H), 7.98-7.99 (d, 1H).

후처리

  1. additionAfter the addition
  2. temperaturethe mixture was heated
  3. temperatureto reflux for 16 hr
  4. customAfter removal of solvents under reduced pressure
  5. customthe crude product was purified by silica gel chromatography (petroleum ether to petroleum ether/EtOAc=50:1)

출처 및 근거

ORD 기록
ord-e2c7da24924145c993adf8b0c253b5ef
출처 데이터셋
uspto-grants-2011_09
특허 번호
US08012976B2

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