Reaction #1750163

Reaction equation

[(4-hydroxy-benzenesulfonyl)-(4-methoxy-benzyl)amino]-acetic acid methyl ester

K2CO3

1-bromo-4-fluorobutane

→

{[4-(4-fluorobutoxy)-benzenesulfonyl](4-methoxy-benzyl)-amino}-acetic acid methyl ester

Solvents

DMF

H2O

Conditions

Workup

1. 1
   workup.ADDITIONis added dropwise at r.t
2. 2
   Extractionextracted with AcOEt
3. 3
   WashThe combined extracts are washed with brine
4. 4
   Dryingdried over MgSO4
5. 5
   Concentrationconcentrated under reduced pressure
6. 6
   OtherThe residue is purified by column chromatography on silica gel (AcOEt:n-hexane=3:1)

Procedure

To a suspension of 1 g (2.74 mmol) of [(4-hydroxy-benzenesulfonyl)-(4-methoxy-benzyl)amino]-acetic acid methyl ester and 1.14 g (8.22 mmol) of K2CO3 in 8 ml of DMF, 0.59 ml (5.47 mmol) of 1-bromo-4-fluorobutane is added dropwise at r.t. After stirring for 18 h at r.t., the reaction mixture is diluted with H2O and extracted with AcOEt. The combined extracts are washed with brine, dried over MgSO4 and concentrated under reduced pressure. The residue is purified by column chromatography on silica gel (AcOEt:n-hexane=3:1) to give {[4-(4-fluorobutoxy)-benzenesulfonyl](4-methoxy-benzyl)-amino}-acetic acid methyl ester; NMR (CDCl3): 1.86-1.96 (m, 4H), 3.57 (s, 3H), 3.79 (s, 3H), 3.90 (s, 2H), 4.08 (t, 2H, J=6.04 Hz), 4.39 (s, 2H), 4.46 (t, 1H, J=6.04 Hz), 4.55-4.65 (m, 1H), 6.83 (d, 2H, J=8.56 Hz), 6.97 (d, 2H, J=9.08 Hz), 7.15 (d, 2H, J=8.56 Hz), 7.82 (d, 2H, J=9.08 Hz).

Source