Nitromethane → HCID 66863000, compound

363 mg (1.0 mmol, 1.03 eq) zinctriflate, 1 ml (18.5 mmol, 19 eq) nitromethane and 174 μl (1.0 mmol, 1.03 eq) diisopropylethylamine were placed in a dry schlenk vessel under Nitrogen. The yellow slurry was cooled in ice and 153.3 mg (0.97 mmol) (S)-methyl 2-isopropyl-4-oxobutanoate was added. The reaction mixture was stirred for 3 h, after which it was quenched with 2 ml 1 N ammonium chloride solution. After separation the water phase was extracted 3 times with 4 ml dichloromethane and the combined organic phases were washed with 4 ml brine and dried with Na2SO4, yielding 365 mg crude material after film evaporation, which contained still diisopropylethylamine according to NMR. The material was dissolved in 5 ml dichloromethane, washed 3 times with 1 ml 1 N HCl, dried with sodiumsulphate yielding 161 mg after removal of the solvent. Column separation (30/70 v/v ethylacetate/heptane) gave the pure target compound (3S)-3-isopropyl-5-(nitromethyl)dihydrofuran-2(3H)-one.

1. temperatureThe yellow slurry was cooled in ice
2. customafter which it was quenched with 2 ml 1 N ammonium chloride solution
3. customAfter separation the water phase
4. extractionwas extracted 3 times with 4 ml dichloromethane
5. washthe combined organic phases were washed with 4 ml brine
6. dry with materialdried with Na2SO4
7. customyielding 365 mg crude material
8. customafter film evaporation, which
9. dissolutionThe material was dissolved in 5 ml dichloromethane
10. washwashed 3 times with 1 ml 1 N HCl
11. dry with materialdried with sodiumsulphate yielding 161 mg
12. customafter removal of the solvent
13. customColumn separation (30/70 v/v ethylacetate/heptane)

ORD record

ord-0338587a61684a03af2b12aac276d02c

Source dataset

uspto-grants-2013_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08563279B2