Lithium Chloride → Ethyl 2-(2-acetamidopyridin-4-yl)-4-bromothiazole-5-carboxylate

HRID 2402106ノート

反応式

HRID 2402106 の反応式
Br[C:2]1[S:3][C:4]([C:8]([O:10][CH2:11][CH3:12])=[O:9])=[C:5]([Br:7])[N:6]=1.C[Sn](C)(C)[C:15]1[CH:20]=[CH:19][N:18]=[C:17]([NH:21][C:22](=[O:24])[CH3:23])[CH:16]=1.[Cl-].[Li+]>O1CCOCC1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.[Cu]I>[C:22]([NH:21][C:17]1[CH:16]=[C:15]([C:2]2[S:3][C:4]([C:8]([O:10][CH2:11][CH3:12])=[O:9])=[C:5]([Br:7])[N:6]=2)[CH:20]=[CH:19][N:18]=1)(=[O:24])[CH3:23]

参加物

7

反応物 3

HCID 433294Lithium ChlorideHCID 59529632N-(4-(trimethylstannyl)pyridin-2-yl)acetamideHCID 66747450Ethyl 2,4-dibromothiazole-5-carboxylate

生成物 1

HCID 66747706Ethyl 2-(2-acetamidopyridin-4-yl)-4-bromothiazole-5-carboxylate収率 53%

試薬・触媒・溶媒 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)触媒HCID 178418397HCID 178418397、化合物触媒HCID 312751,4-Dioxane溶媒

実験手順

A mixture of ethyl 2,4-dibromothiazole-5-carboxylate (0.500 g, 1.59 mmol), N-(4-(trimethylstannyl)pyridin-2-yl)acetamide (0.569 g, 1.90 mmol), tetrakis(triphenylphosphine)palladium(0) (91.7 mg, 0.0794 mmol), copper(I) iodide (90.7 mg, 0.476 mmol), and lithium chloride (202 mg, 4.76 mmol) in dioxane (29.1 mL) was degassed with nitrogen and heated at reflux for 1 hr. The reaction was cooled and concentrated in vacuo. The residue was purified by silica gel chromatography (ethyl acetate/hexane=0/100→50/50) to give 312 mg of the title compound. (44% yield). LC/MS (FA) ES+ 370, 372. 1H NMR (400 MHz, CDCl3) δ: 8.71 (s, 1H), 8.39 (d, 1H, J=5.2 Hz), 8.25 (bs, 1H), 7.68 (dd, 1H, J=5.2, 1.6 Hz), 4.41 (q, 2H, J=7.2 Hz), 2.26 (s, 3H), 1.41 (t, 3H, J=7.2 Hz).

後処理

  1. customwas degassed with nitrogen
  2. temperatureheated
  3. temperatureat reflux for 1 hr
  4. temperatureThe reaction was cooled
  5. concentrationconcentrated in vacuo
  6. customThe residue was purified by silica gel chromatography (ethyl acetate/hexane=0/100→50/50)

出典と根拠

ORDレコード
ord-efd2d47bec5b4c8faf957a14531124c1
出典データセット
uspto-grants-2014_08
特許番号
US08796271B2

反応ノート

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