Ethylene Oxide → Ethyl 1-(3-butenyl)cyclopropanecarboxylate

To a stirred suspension of NaH (60% dispersion in mineral oil, 3.02 g, 75.5 mmol) in dry benzene (100 mL), at 22° C. and under nitrogen, was added dropwise ethyl 2-(diethoxyphosphoryl)hex-5-enoate with anhydrous EtOH (0.044 mL, 0.76 mmol) over 30 minutes. Stirred for 30 minutes, this reaction, cooled at 0° C. and attached with a dry ice/acetone condenser, was added via cannula ethylene oxide (12.7 g, 289.3 mmol), then refluxed at 50° C. for 5 hours. Quenched at 22° C. with 1N aqueous NH4Cl (100 mL), the reaction solution was extracted with Et2O (3×200 mL). The combined Et2O layers were washed with aqueous saturated NaHCO3 (100 mL), water (70 mL), brine (70 mL), dried over Na2SO4, filtered and concentrated. The residue was flash chromatographed on 120 g silica gel 60, eluting with 20-100% EtOAc/Hexane, to give the title product (5.07 g, 48%). LRMS (ESI) m/z 169.2 [(M+H)+; calcd for C10H17O2: 169.1].

1. customthis reaction
2. customattached with a dry ice/acetone condenser
3. temperaturerefluxed at 50° C. for 5 hours
4. customQuenched at 22° C. with 1N aqueous NH4Cl (100 mL)
5. extractionthe reaction solution was extracted with Et2O (3×200 mL)
6. washThe combined Et2O layers were washed with aqueous saturated NaHCO3 (100 mL), water (70 mL), brine (70 mL)
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated
10. customchromatographed on 120 g silica gel 60
11. washeluting with 20-100% EtOAc/Hexane

ORDレコード

ord-5b0daf7e62fc4ad984e598be2fcd9fdf

出典データセット

uspto-grants-2012_07

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08216999B2