4-Toluenesulfonyl chloride → Toluene-4-sulfonic acid 2-{1-[2-(4-cyanophenoxy)ethyl]ureido}ethyl ester

To a solution of intermediate 1-[2-(4-cyanophenoxy)ethyl]-1-(2-hydroxy-ethyl)urea (4.7 g, 0.0188 mol; see step (i) above) in dry THF (150 mL) was added n-butyllithium (18.89 mL, 1.1 M) at −78° C. The reaction mixture was stirred at −78° C. for 1 h, after which a solution of freshly crystallised p-toluenesulfonyl chloride (4.3 g, 0.023 mol) in THF (50 mL) was added dropwise. The reaction mixture was then stirred at −78° C. for a further 30 min, before being warmed to −30° C., and stirred for 2 h more. The reaction mixture was quenched with water and extracted with ethyl acetate. The organic layer was washed with brine, dried over Na2SO4, concentrated and the residue was recrystallised in ethyl acetate/hexane to yield the title compound as an off-white solid. Yield: 3.5 g.

1. stirringThe reaction mixture was then stirred at −78° C. for a further 30 min
2. temperaturebefore being warmed to −30° C.
3. stirringstirred for 2 h more
4. customThe reaction mixture was quenched with water
5. extractionextracted with ethyl acetate
6. washThe organic layer was washed with brine
7. dry with materialdried over Na2SO4
8. concentrationconcentrated
9. customthe residue was recrystallised in ethyl acetate/hexane

ORD record

ord-e1d92b6af75444748c6306b7e641ee48

Source dataset

uspto-grants-2008_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07354917B2