Water → HCID 22620204, compound

Temperature

-42 °C

To a stirred solution of 1-(tert-Butoxycarbonyl)-4-chloro-2-n-hexyl-1,2-dihydropyridine (4.84 g, 16.14 mmol) in 180 ml of THF at −42° C. was added n-butyllithium (19.4 mL, 19.37 mmol) dropwise via syringe. After the mixture had stirred at −42° C. for 1 h, iodomethane (3.0 mL, 48.42 mmol) was added and stirring was continued at −42° C. for 1 h and then at room temperature for 1 h. Water (50 mL) and ether (100 mL) were added, the layers were separated, the aqueous phase was extracted with ether (2×15 mL), and the combined organic extracts were washed with brine. The organic phase was dried over K2CO3 filtered through silica gel/Celite, and concentrated in vacuo to give the crude product. Purification by column chromatography with 5% EtOAc in hexanes afforded 4.89 g (73.4%) of the product as an orange oil that was homogeneous by TLC analysis. 1H NMR (250 MHz) δ5.65-5.58 (d, 1 H), 5.32 (br s, 1 H), 4.84-4.72 (q, 1 H), 2.13 (s, 3 H), 1.75-1.21 (m, 19 H), 0.91-0.85 (t, 3 H).

1. stirringstirring
2. waitwas continued at −42° C. for 1 h
3. waitat room temperature for 1 h
4. customthe layers were separated
5. extractionthe aqueous phase was extracted with ether (2×15 mL)
6. washthe combined organic extracts were washed with brine
7. dry with materialThe organic phase was dried over K2CO3
8. filtrationfiltered through silica gel/Celite
9. concentrationconcentrated in vacuo
10. customto give the crude product
11. customPurification by column chromatography with 5% EtOAc in hexanes

ORD record

ord-4fa13f54cdc04fe297d9dd4e3b69bf7a

Source dataset

uspto-grants-2002_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06369078B1