Water → HCID 21184142, compound

Temperature

-78 °C

To a solution of bromocyclopropane (2.54 ml, 31.7 mmol) in diethyl ether (50 ml) at −78° C. under nitrogen was added, dropwise, tert-butyllithium (18.2 ml of a 1.7 M solution in pentane, 31 mmol). Diethyl ether (30 ml) was then added and the mixture stirred for 1 hour at −78° C. A solution of cyclopentanone (2.74 ml, 34 mmol) in diethyl ether (40 ml) was then added dropwise. The reaction was stirred for 4 hours at −78° C. and was then allowed to warm to room temperature over 16 hours. Water (40 ml) was added, cautiously, and the aqueous layer extracted with diethyl ether (2×40 ml). The combined ether layers were dried using sodium sulphate, filtered and evaporated under reduced pressure to give an oily residue. This was chromatographed using silica gel eluting with a solvent gradient of dichloromethane:methanol (100:0 changing to 9:1, by volume) to provide the title compound (3.5 g). TLC Rf=0.4 (silica, dichloromethane:methanol, 9:1, by volume).

1. stirringThe reaction was stirred for 4 hours at −78° C.
2. temperatureto warm to room temperature over 16 hours
3. extractioncautiously, and the aqueous layer extracted with diethyl ether (2×40 ml)
4. dry with materialThe combined ether layers were dried
5. filtrationfiltered
6. customevaporated under reduced pressure
7. customto give an oily residue
8. customThis was chromatographed

ORD record

ord-83d6830a29ea4d7ab548b8ffcdf28a73

Source dataset

uspto-grants-2001_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06262075B1