Ethanol → [5-(2-Amino-phenyl)-thiophen-2-yl]-acetic acid methyl ester

HRID 2075004

反応式

HRID 2075004 の反応式
N#N.C(O)C.Cl.[NH2:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=1B(O)O.[CH3:17][O:18][C:19](=[O:27])[CH2:20][C:21]1[S:22][C:23](Br)=[CH:24][CH:25]=1>O.C1(C)C=CC=CC=1.[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>[CH3:17][O:18][C:19](=[O:27])[CH2:20][C:21]1[S:22][C:23]([C:9]2[CH:10]=[CH:11][CH:12]=[CH:13][C:8]=2[NH2:7])=[CH:24][CH:25]=1

参加物

8

反応物 4

HCID 702EthanolHCID 947NitrogenHCID 12403315Methyl 2-(5-bromothiophen-2-yl)acetateHCID 164270902-Aminophenylboronic acid hydrochloride

生成物 1

HCID 16116160[5-(2-Amino-phenyl)-thiophen-2-yl]-acetic acid methyl ester収率 51.3%

試薬・触媒・溶媒 3

HCID 11979704Tetrakis(triphenylphosphine)palladium触媒HCID 962Water溶媒HCID 1140Toluene溶媒2 回

反応条件

温度
100 °C

実験手順

(The following reaction is carried out in an N2 atmosphere.) Ethanol (3.7 mL), tetrakis-(triphenylphosphine)-palladium(0) (289 mg, 0.25 mmol) and Na2CO3 decahydrate (4.0 g, 14.0 mmol) dissolved in water (5.2 mL) are subsequently added to a solution of 2-amino-benzeneboronic acid hydrochloride (910 mg, 5.25 mmol) in toluene (52 mL). Degas the reaction mixture carefully (5 times) and flush with N2 again. A solution of (5-bromo-thiophen-2-yl)-acetic acid methyl ester (43) (1.17 g, 5.0 mmol) in toluene (4.5 mL) is added. Degas the mixture again (5 times) and stir for 22 h at 100° C. Partition the reaction solution between EtOAc and brine and extract the separated aqueous layer with EtOAc (3 times). Wash combined organic layer with water and brine and dry it with Na2SO4. Purify the crude product by preparative radial chromatography (CyH/EtOAc 5+1] to obtain [5-(2-amino-phenyl)-thiophen-2-yl]-acetic acid methyl ester (44) as a brown oil (634 mg, 51%). 1H NMR (400 MHz, CDCl3): 3.73 (s, 3 H); 3.83 (s, 2 H); 3.92-4.07 (br.s, 2 H); 6.74 (d, 1 H); 6.76 (td, 1 H, J1=7.6 Hz, J2=1.3 Hz); 6.92 (d, 1 H, J=3.5 Hz); 7.02 (d, 1 H, J=3.5 Hz); 7.11 (td, 1 H, J=7.6 Hz, J2=1.5 Hz); 7.23 (dd, 14 H, J1=7.6 Hz, J2=1.5 Hz).

後処理

  1. custom(The following reaction
  2. customDegas the reaction mixture carefully (5 times)
  3. customflush with N2 again
  4. customDegas the mixture again (5 times)
  5. customPartition the reaction solution between EtOAc and brine
  6. extractionextract the separated aqueous layer with EtOAc (3 times)
  7. washWash
  8. dry with materialdry it with Na2SO4
  9. customPurify the crude product by preparative radial chromatography (CyH/EtOAc 5+1]

出典と根拠

ORDレコード
ord-c8e007133a6b4f87919f3eb0ff66e439
出典データセット
uspto-grants-2011_04
特許番号
US07919532B2

関連ノート

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