Hydrochloric Acid → HCID 86709716, compound

Temperature

-30 °C

A solution of N,N-diisopropylamine (1.28 mL, 9.1 mmol) in anhydrous tetrahydrofuran (15 mL) was cooled to −30° C. before adding n-butyllithium (3.22 mL, 8.08 mmol, 2.5 M in hexanes). The reaction mixture was stirred at −30° C. for 15 minutes before adding a solution of 2-(tetrahydro-furan-3-yl)-propionic acid ethyl ester (0.87 g, 5.05 mmol) in tetrahydrofuran (6 mL) dropwise over 3 minutes. The reaction mixture was stirred for a further 15 minutes at −30° C. before adding dibromobis(tributylphosphine)palladium(II) (40 mg, 50 μmol) and then a solution of vinylbromide (9.0 mL, 9.0 mmol, 1 M in tetrahydrofuran). The reaction mixture was stirred at −30° C. for 30 minutes then warmed to room temperature for 18 h. The reaction mixture was treated with hydrochloric acid (2 M, 20 mL). The mixture was extracted with diethyl ether (3×20 mL). The organics extract was dried over anhydrous sodium sulfate, filtered and evaporated. The residue was purified by silica gel chromatography using iso-hexanes/diethyl ether 3:2 to yield the title product (237 mg, 24%) as a yellow oil. 1H NMR (300 MHz, CDCl3) δ 1.14-1.30 (m, 6H), 1.61-1.75 (m, 1H), 1.84-1.99 (m, 1H), 2.68-2.82 (m, 1H), 3.52-3.95 (m, 4H), 4.10-4.21 (m, 2H), 5.09-5.23 (m, 2H), 5.95-6.07 (m, 1H). LCMS (m/z) 199.2 [M+H], Tr=2.17 min.

1. stirringThe reaction mixture was stirred for a further 15 minutes at −30° C.
2. stirringThe reaction mixture was stirred at −30° C. for 30 minutes
3. temperaturethen warmed to room temperature for 18 h
4. extractionThe mixture was extracted with diethyl ether (3×20 mL)
5. extractionThe organics extract
6. dry with materialwas dried over anhydrous sodium sulfate
7. filtrationfiltered
8. customevaporated
9. customThe residue was purified by silica gel chromatography

ORD record

ord-3719bd3b0b6c484eb96db2bc50cffcbb

Source dataset

uspto-grants-2015_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09145441B2