Phosphorus oxychloride → 4-(2-chloro-4-thiazolyl)Pyridine

HRID 4350

反応式

HRID 4350 の反応式
O[C:2]1[S:3][CH:4]=[C:5]([C:7]2[CH:12]=[CH:11][N:10]=[CH:9][CH:8]=2)[N:6]=1.P(Cl)(Cl)([Cl:15])=O>>[Cl:15][C:2]1[S:3][CH:4]=[C:5]([C:7]2[CH:12]=[CH:11][N:10]=[CH:9][CH:8]=2)[N:6]=1

参加物

3

反応物 2

HCID 24813Phosphorus oxychlorideHCID 178418513HCID 178418513、化合物

生成物 1

HCID 140969694-(2-chloro-4-thiazolyl)Pyridine収率 29%

反応条件

温度
140 °C

実験手順

A mixture of 2-hydroxy-4-(4-pyridyl)thiazole (17.8 g, 0.10 mol) in phosphorous oxychloride (175 mL) was heated at 140° C. for 48 hours then quenched by carefully pouring onto ice (4000 mL). The resulting mixture was basified with 50% sodium hydroxide to pH 9 and extracted with methylene chloride (5×400 mL). The combined extracts were dried over sodium sulfate, concentrated, and chromatographed over silica gel (ethyl acetate as eluant). Recrystallization from ethyl acetate/hexane afforded 2-chloro-4-(4-pyridyl)thiazole (5.70 g, 29%). mp. 124°-125° C.

後処理

  1. customthen quenched
  2. additionby carefully pouring onto ice (4000 mL)
  3. extractionextracted with methylene chloride (5×400 mL)
  4. dry with materialThe combined extracts were dried over sodium sulfate
  5. concentrationconcentrated
  6. customchromatographed over silica gel (ethyl acetate as eluant)
  7. customRecrystallization from ethyl acetate/hexane

出典と根拠

ORDレコード
ord-6a872e674f0846bc9fa7a078ae69e05f
出典データセット
uspto-grants-1988_02
特許番号
US04725606

関連ノート

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