5-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3-benzothiazole → 6-(benzo[d]thiazol-5-yl)-N-(3,4-dimethoxyphenyl)imidazo[1,2-a]pyrazin-8-amine

HRID 1615700ノート

反応式

HRID 1615700 の反応式
Br[C:2]1[N:3]=[C:4]([NH:11][C:12]2[CH:17]=[C:16]([O:18][CH3:19])[C:15]([O:20][CH3:21])=[C:14](OC)[CH:13]=2)[C:5]2[N:6]([CH:8]=[CH:9][N:10]=2)[CH:7]=1.CC1(C)C(C)(C)OB([C:32]2[CH:33]=[CH:34][C:35]3[S:39][CH:38]=[N:37][C:36]=3[CH:40]=2)O1>C(=O)([O-])[O-].[Na+].[Na+].O1CCOCC1.CO.C(OCC)(=O)C.[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[S:39]1[C:35]2[CH:34]=[CH:33][C:32]([C:2]3[N:3]=[C:4]([NH:11][C:12]4[CH:13]=[CH:14][C:15]([O:20][CH3:21])=[C:16]([O:18][CH3:19])[CH:17]=4)[C:5]4[N:6]([CH:8]=[CH:9][N:10]=4)[CH:7]=3)=[CH:40][C:36]=2[N:37]=[CH:38]1

参加物

7

反応物 2

HCID 467390305-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3-benzothiazoleHCID 866449836-bromo-N-(3,4,5-trimethoxyphenyl)imidazo[1,2-a]pyrazin-8-amine

生成物 1

HCID 462346246-(benzo[d]thiazol-5-yl)-N-(3,4-dimethoxyphenyl)imidazo[1,2-a]pyrazin-8-amine収率 70%

試薬・触媒・溶媒 4

HCID 11979704Tetrakis(triphenylphosphine)palladium触媒HCID 10340Sodium Carbonate溶媒HCID 312751,4-Dioxane溶媒HCID 21584119Ethylacetate methanol溶媒

実験手順

A mixture of 6-bromo-N-(3,4-dimethoxyphenyl)imidazo[1,2-a]pyrazin-8-amine (2) (209 mg, 0.601 mmol), and 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzo[d]thiazole (3) (180 mg, 0.689 mmol) in 1 M aqueous sodium carbonate (0.76 mL) and 1,4-dioxane (2.4 mL) was sparged with nitrogen while stirring for 5 min. Tetrakis(triphenyl-phosphine) palladium(0) (69 mg, 0.06 mmol) was then added and the resulting mixture reacted under microwave irradiation at 135° C. for 30 min. After this time, the reaction was cooled to ambient temperature, diluted with 1:9 methanol/ethyl acetate (75 mL), and washed with water (50 mL) then brine (50 mL). The organic phase was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by chromatography (silica, gradient 0% to 10% methanol in methylene chloride) to afford 6-(benzo[d]thiazol-5-yl)-N-(3,4-dimethoxyphenyl)imidazo[1,2-a]pyrazin-8-amine (4) (169 mg, 70%) as an off-white solid: mp 179-181° C.; 1H NMR (300 MHz, DMSO-d6) δ 9.56 (s, 1H), 9.45 (s, 1H), 8.78 (s, 1H), 8.76 (d, 1H, J=1.2 Hz), 8.26 (d, 1H, J=8.7 Hz), 8.14 (m, 2H), 8.00 (s, 1H), 7.66 (s, 1H), 7.58 (dd, 1H, J=8.7, 2.4 Hz), 6.99 (d, 1H, J=8.7 Hz), 3.87 (s, 3H), 3.76 (s, 3H); MS m/z 404.6 [M+H]+; HPLC, 6.475 min, 98.6% (AUC).

後処理

  1. customwas sparged with nitrogen
  2. customthe resulting mixture reacted under microwave irradiation at 135° C. for 30 min
  3. washwashed with water (50 mL)
  4. dry with materialThe organic phase was dried over anhydrous sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customThe resulting residue was purified by chromatography (silica, gradient 0% to 10% methanol in methylene chloride)

出典と根拠

ORDレコード
ord-4df9cb7544f94ec6ab54cc93fa5c94a1
出典データセット
uspto-grants-2014_07
特許番号
US08765761B2

反応ノート

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