Sulfuric Acid → 7-Isopropyl-4-methyl-benzooxazol-6-ol

HRID 81857

反応式

HRID 81857 の反応式
[NH2:1][C:2]1[C:7]([CH3:8])=[CH:6][C:5]([OH:9])=[C:4]([CH:10]([CH3:12])[CH3:11])[C:3]=1[OH:13].O[C:15]1C=C(C(C)C)C=C(O)C=1C.C1(C)CC(=O)C(C(C)C)C(=O)C1.C(OC(OCC)OCC)C.OS(O)(=O)=O>CCO.[Cl-].[Ti+4].[Cl-].[Cl-].[Cl-]>[CH:10]([C:4]1[C:3]2[O:13][CH:15]=[N:1][C:2]=2[C:7]([CH3:8])=[CH:6][C:5]=1[OH:9])([CH3:11])[CH3:12]

参加物

8

反応物 5

HCID 1118Sulfuric AcidHCID 31214Ethyl orthoformateHCID 119881382-Isopropyl-5-methylcyclohexane-1,3-dioneHCID 23345336CymorcinHCID 595987544-Amino-2-isopropyl-5-methyl-benzene-1,3-diol

生成物 1

HCID 595986577-Isopropyl-4-methyl-benzooxazol-6-ol

試薬・触媒・溶媒 2

HCID 160960Diamminetetrachlorotitanate(IV)触媒HCID 702Ethanol溶媒2 回

反応条件

温度
0 °C

実験手順

To a flask charged with 4-amino-2-isopropyl-5-methyl-benzene-1,3-diol (450 mg, 2.5 mmol) (Treibs and Albrecht, “The dihydroxycymenes. IV. Isocymorcin (3,5-dihydroxycymene) from 3,5-menthanedione by dehydrogenation and total synthesis,” Journal fuer Praktische Chemie (1961), 13, 291-305), purged with argon, and cooled to 0° C. was sequentially added triethylorthoformate (0.7 mL, 4.2 mmol), EtOH (4 mL), and a 10% v/v solution of H2SO4 in EtOH (40 μL). The reaction was allowed to warm to room temperature slowly, stirred overnight, quenched with saturated NaHCO3, and concentrated. The residue was partitioned between water and methylene chloride. The combined organic phases were dried with Na2SO4 and concentrated to provide 510 mg of 7-isopropyl-4-methyl-benzooxazol-6-ol.

後処理

  1. custompurged with argon
  2. temperatureto warm to room temperature slowly
  3. customquenched with saturated NaHCO3
  4. concentrationconcentrated
  5. customThe residue was partitioned between water and methylene chloride
  6. dry with materialThe combined organic phases were dried with Na2SO4
  7. concentrationconcentrated

出典と根拠

ORDレコード
ord-99a01c0b516c4dbfbe70870eb1e10cb7
出典データセット
uspto-grants-2014_09
特許番号
US08846705B2

関連ノート

読み込み中…