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

HRID 2075004

반응식

HRID 2075004 반응식
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

참가 물질

8

반응물 4

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

생성물 1

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

시약·촉매·용매 3

HCID 11979704Tetrakis(triphenylphosphine)palladium촉매HCID 962Water용매HCID 1140Toluene용매2회

반응 조건

온도
100 °C

실험 절차

(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).

후처리

  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]

출처 및 근거

ORD 기록
ord-c8e007133a6b4f87919f3eb0ff66e439
출처 데이터셋
uspto-grants-2011_04
특허 번호
US07919532B2

연결된 노트

불러오는 중…