tert-butyl 1H-imidazole-1-carboxylate → tert-butyl (3R)-6-cyclohexyl-3-[3-(1H-imidazol-2-ylmethyl)-1,2,4-oxadiazol-5-yl]hexanoate

A solution of tert-butyl 1H-imidazole-1-carboxylate (133 mg, 0.79 mmol) in anhydrous tetrahydrofuran (2 ml), cooled to −78° C., treated with n-butyl lithium, 2.5M in hexanes (320 μl, 0.79 mmol) and stirred under a nitrogen atmosphere for 1 hour. A solution of tert-butyl (3R)-6-cyclohexyl-3-[3-({[(4-methylphenyl)sulfonyl]oxy}methyl)-1,2,4-oxadiazol-5- yl]hexanoate (Preparation 92) (400 mg, 0.79 mmol) in anhydrous tetrahydrofuran (2 ml) was added slowly and the mixture was allowed to warm to room temperature and stirred at this temperature for 18 hours. The reaction mixture was partitioned between ethyl acetate (30 ml) and water (30 ml). The organic layer was washed once more with water (20 ml), dried over anhydrous sodium sulphate, filtered and the solvent removed under reduced pressure to afford the title compound as a pale yellow oil (307 mg).

1. stirringstirred at this temperature for 18 hours
2. customThe reaction mixture was partitioned between ethyl acetate (30 ml) and water (30 ml)
3. washThe organic layer was washed once more with water (20 ml)
4. dry with materialdried over anhydrous sodium sulphate
5. filtrationfiltered
6. customthe solvent removed under reduced pressure

ORD-Eintrag

ord-4bd86b661dc547c89dc63b5f3a2af98c

Quelldatensatz

uspto-grants-2005_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06897306B2