Water → 4-Bromopyridazine-3,6-diol

HRID 47225

反応式

HRID 47225 の反応式
[Br:1][C:2]1[C:3](O[C:6](=[O:8])[CH:7]=1)=[O:4].C([O-])(=O)C.[Na+].O.[NH2:15][NH2:16].O>C(O)(=O)C.O>[Br:1][C:2]1[C:3](=[O:4])[NH:15][NH:16][C:6](=[O:8])[CH:7]=1

参加物

6

反応物 4

HCID 962WaterHCID 24654Hydrazine hydrate (1:1)HCID 800273-Bromo-2,5-furandioneHCID 517045Sodium Acetate

生成物 1

HCID 2549424-Bromopyridazine-3,6-diol収率 37%

試薬・触媒・溶媒 1

HCID 21899381Acetic acid--water (1/1)溶媒

反応条件

温度
100 °C

実験手順

A mixture of bromomaleic anhydride (50 g, 283 mmol) and sodium acetate (76.5 g, 562 mmol) in 40% acetic acid/water (750 ml) was treated with hydrazine monohydrate (16.5 ml, 339 mmol) at room temperature under nitrogen. The brown solution was stirred and heated at 100° C. for 18 hours. Upon cooling the mixture was poured into water (11) and extracted with ethyl acetate (6×500 ml). The combined extracts were dried (MgSO4), filtered and evaporated to afford the title compound (20 g, 37%) as an orange solid. 1H NMR (250 MHz, d6-DMSO) δ7.68 (1H, br s). MS (ES+) m/e 193 [MH]+, 191 [MH]+. This material was used without further purification.

後処理

  1. temperatureUpon cooling the mixture
  2. extractionextracted with ethyl acetate (6×500 ml)
  3. dry with materialThe combined extracts were dried (MgSO4)
  4. filtrationfiltered
  5. customevaporated

出典と根拠

ORDレコード
ord-8aca293d090446adaace60d29ff64fea
出典データセット
uspto-grants-2004_03
特許番号
US06699859B1

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