Tetrahydrofuran → Fur-2-ylmethyl 2-hydroxyethyl ether

Combine ethyl 2-fur-2-ylmethoxyaceate (1.2 g, 6.5 mmol) and tetrahydrofuran (10 mL). Cool in an ice-bath. Add dropwise a solution of lithium aluminum hydride (8.0 mL, 1.0 M in THF, 8.0 mmol). After 2 hours, add water (0.3 mL), add 15% sodium hydroxide solution (0.3 mL), and add water (0.9 mL). Stir vigorously. After 15 minutes, filter the reaction mixture and dry the filtrate over Na2SO4, filter, and concentrate in vacuo to give a residue. Chromatograph the residue on silica gel eluting with 2% ethyl acetate/dichloromethane to give fur-2-ylmethyl 2-hydroxyethyl ether: Rf =0.22 (silica gel, 5% acetone/dichloromethane) Combine 1-(t-butoxycarbonyl)-4-(1H-benzimidazole-2-carbonyl)piperidine (1.71 g, 5.2 mmol), fur-2-ylmethyl 2-hydroxyethyl ether (0.74 g, 5.2 mmol), and triphenylphosphine (1.67 g, 6.4 mmol) in tetrahydrofuran (20 mL). Add diethyl azodicarboxylate (1.0 mL, 6.35 mmol). After 21 hours, evaporate the reaction mixture in vacuo to give a residue. Chromatograph the residue on silica gel eluting with 5% acetone/dichloromethane to give 1-(t-butoxycarbonyl)-4-(1-(2-fur-2-ylmethoxy-ethyl)-1H-benzimidazole-2-carbonyl)piperidine: Rf =0.30 (silica gel, 5% acetone/dichloromethane).

1. temperatureCool in an ice-bath
2. waitAfter 15 minutes
3. filtrationfilter the reaction mixture
4. dry with materialdry the filtrate over Na2SO4
5. filtrationfilter
6. concentrationconcentrate in vacuo
7. customto give a residue

ORD record

ord-ebdaf0ad0a28491ca60eca06a0f772ef

Source dataset

uspto-grants-1999_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05998439