Reaktion #338435

Reaktionsgleichung

cesium hydroxide monohydrate

1-pyridin-2-yl-ethylamine

2-chloromethyl-benzoimidazole-1-carboxylic acid tert-butyl ester

→

2-[(1-pyridin-2-yl-ethylamino)-methyl]-2,3-dihydro-benzoimidazole-1-carboxylic acid tert-butyl ester

Ausbeute 61.0%

Lösungsmittel

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONTo a suspension
2. 2
   Sonstigeof crushed
3. 3
   Trocknendried 3 A molecular sieves (1.0393 g) in DMF (15 mL)
4. 4
   workup.STIRRINGwas stirred for 30 minutes
5. 5
   workup.STIRRINGthe reaction was stirred at room temperature for 19 hours
6. 6
   FiltrationThe reaction mixture was filtered with CH2Cl2
7. 7
   Einengenconcentrated
8. 8
   workup.ADDITIONdiluted with 1N NaOH (75 mL) and CH2Cl2 (100 mL)
9. 9
   SonstigeThe layers were separated
10. 10
    Extraktionthe aqueous phase was extracted with CH2Cl2 (4×150 mL)
11. 11
    WaschenThe combined organic layers were washed with brine (1×100 mL)
12. 12
    Trocknendried (Na2SO4)
13. 13
    Einengenconcentrated
14. 14
    SonstigePurification of the crude material by column chromatography on silica gel (33:1:1 CH2Cl2-MeOH—NH4OH)

Vorschrift

To a suspension of crushed and dried 3 A molecular sieves (1.0393 g) in DMF (15 mL) was added cesium hydroxide monohydrate (0.6272 g, 3.7 mmol) and DMAP (0.0366 g, 0.3 mmol), and the mixture was stirred at room temperature for 15 minutes. To this was added 1-pyridin-2-yl-ethylamine (0.4168 g, 3.4 mmol) in DMF (10 mL), and was stirred for 30 minutes. Then 2-chloromethyl-benzoimidazole-1-carboxylic acid tert-butyl ester (1.1050 g, 4.1 mmol) was added and the reaction was stirred at room temperature for 19 hours. The reaction mixture was filtered with CH2Cl2, concentrated, and diluted with 1N NaOH (75 mL) and CH2Cl2 (100 mL). The layers were separated and the aqueous phase was extracted with CH2Cl2 (4×150 mL). The combined organic layers were washed with brine (1×100 mL), dried (Na2SO4), and concentrated. Purification of the crude material by column chromatography on silica gel (33:1:1 CH2Cl2-MeOH—NH4OH) provided 0.7260 g (61%) of 2-[(1-pyridin-2-yl-ethylamino)-methyl]-2,3-dihydro-benzoimidazole-1-carboxylic acid tert-butyl ester as an orange oil. 1H NMR (CDCl3) δ 1.47 (d, 3H, J=6.0 Hz), 1.66 (s, 9H), 2.92 (d, 2H, J=31.0 Hz), 4.00-4.07 (m, 1H), 4.13-4.29 (m, 1H), 7.03-7.04 (m, 1H), 7.27-7.33 (m, 3H), 7.48-7.55 (m, 1H), 7.65-7.70 (m, 1H), 7.82-7.86 (m, 1H), 8.48 (d, 1H, J=4.8 Hz).

Quelle