Formic Acid → 3,5-Diacetoxybenzoic Acid

HRID 78870

反応式

HRID 78870 の反応式
[OH:1][C:2]1[CH:3]=[C:4]([CH:8]=[C:9]([OH:11])[CH:10]=1)[C:5]([OH:7])=[O:6].[C:12](OC(=O)C)(=[O:14])[CH3:13].N1[CH:24]=[CH:23]C=CC=1.C(O)=[O:26]>CCOC(C)=O.O>[C:12]([O:1][C:2]1[CH:3]=[C:4]([CH:8]=[C:9]([O:11][C:23](=[O:26])[CH3:24])[CH:10]=1)[C:5]([OH:7])=[O:6])(=[O:14])[CH3:13]

参加物

7

反応物 4

HCID 284Formic AcidHCID 1049PyridineHCID 74243,5-Dihydroxybenzoic AcidHCID 7918Acetic Anhydride

生成物 1

HCID 5398693,5-Diacetoxybenzoic Acid収率 75.3%

試薬・触媒・溶媒 2

HCID 962Water溶媒HCID 8857Ethyl Acetate溶媒

反応条件

温度
0 °C

実験手順

To a solution of 3,5-dihydroxybenzoic acid (7.71 g, 50 mmol) in EtOAc (110 mL) were added acetic anhydride (12.25 mL, 130 mmol) and pyridine (8.08 mL, 100 mmol) in an ice-water bath under a nitrogen atmosphere. The mixture was stirred at 0° C. for 40 min and then stirred at ambient temperature for 4 h. 98% Formic acid (2.36 mL, 60 mmol) was added and the resulting mixture was stirred for 1 h. Then, it was poured into water and extracted with EtOAc. The organic phase was washed with water and brine, dried over Na2SO4, filtered, and evaporated in vacuo. Purification of the residue via recrystallization from n-heptane/EtOAc provided 3,5-diacetoxybenzoic acid (8.97 g, 75.3%) as white solid. Data are: 1H NMR (CDCl3, 300 MHz) δ 12.1 (bs, 1H), 7.73 (d, 2H), 7.21 (t, 1H), 2.32 (s, 6H); 13C NMR (CDCl3, 75 MHz) δ 170.4, 169.0, 151.2, 131.5, 121.3, 121.0, 21.2; mp=161-162° C.; HRMS (EI+) found 238.0475 M+, calcd 238.0477 for C11H10O6; Anal. Calcd for C11H10O6: C, 55.47; H, 4.23. Found: C, 55.62; H, 4.37.

後処理

  1. stirringstirred at ambient temperature for 4 h
  2. stirringthe resulting mixture was stirred for 1 h
  3. extractionextracted with EtOAc
  4. washThe organic phase was washed with water and brine
  5. dry with materialdried over Na2SO4
  6. filtrationfiltered
  7. customevaporated in vacuo
  8. customPurification of the residue
  9. customvia recrystallization from n-heptane/EtOAc

出典と根拠

ORDレコード
ord-9c8e2e276b2d4d76947e32fe7bac5d91
出典データセット
uspto-grants-2014_09
特許番号
US08841477B2

関連ノート

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