Reaktion #618108

Reaktionsgleichung

ammonium chloride

tert-butyl cyclopropylcarboxylate

2-(4-bromobutoxy)tetrahydro-2H-pyran

lithium diisopropylamide

→

title compound

Ausbeute 48.9%

tert-butyl 1-[4-(tetrahydro-2H-pyran-2-yloxy)butyl]cyclopropanecarboxylate

Ausbeute 48.9%

Lösungsmittel

hexane ethyl acetate

water

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONAfter completion of addition
2. 2
   workup.ADDITIONwere added
3. 3
   Extraktionfollowed by extraction
4. 4
   WaschenThe organic layer was washed with dilute hydrochloric acid, water
5. 5
   Trocknenan aqueous saturated sodium chloride solution, and dried with anhydrous sodium sulfate
6. 6
   SonstigeThe residue obtained by concentration
7. 7
   Sonstigewas purified by silica gel column chromatography (hexane:ethyl acetate, 98:2→90:10)

Vorschrift

Under the argon atmosphere, tert-butyl cyclopropylcarboxylate (3.76 g) and 2-(4-bromobutoxy)tetrahydro-2H-pyran (7.52 g) were dissolved in anhydrous/THF (106 mL), followed by cooling to an inner temperature of −65° C. A lithium diisopropylamide solution (2.0M, THF:heptane:ethylbenzene solution) (19.8 mL) was added dropwise over 15 minutes. After completion of addition, the mixture was stirred at room temperature for 8 hours. An aqueous saturated ammonium chloride solution was added to stop the reaction, and water, and hexane:ethyl acetate (1:1) were added, followed by extraction. The organic layer was washed with dilute hydrochloric acid, water and an aqueous saturated sodium chloride solution, and dried with anhydrous sodium sulfate. The residue obtained by concentration was purified by silica gel column chromatography (hexane:ethyl acetate, 98:2→90:10) to obtain the title compound (3.86 g) having the following physical property values.

Quelle