4-Methylmorpholine → HCID 118092700, compound

To 16E (8.0 g, 22.91 mmol), 4-methylmorpholine (3.02 mL, 27.5 mmol) in THF (100 mL) at −20° C. was added ethyl chloroformate (2.420 mL, 25.2 mmol). The mixture was stirred for 20 min. The cloudy reaction mixture was filtered. The filtrate was treated with sodium borohydride (1.213 g, 32.1 mmol) and MeOH (30 mL) slowly from −20° C. The mixture was stirred at −20° C. for 15 min. and then at rt for 1 h. The reaction was quenched with addition of sat. ammonium chloride. Organic solvent was removed under reduced pressure. The residue was partitioned between EtOAc/water. The organic layers were collected, washed with sat. sodium bicarbonate and brine, dried over sodium sulfate and concentrated. The crude product was purified by flash chromatography (0-40% ethyl acetate/hexanes). The desired fractions were combined and concentrated to give 16F (5.93 g, 17.69 mmol, 77% yield). MS (ESI) (m/z): 357, 359.4 (M+Na)+. 1H NMR (400 MHz, chloroform-d) δ ppm 7.27-7.40 (m, 7H) 7.01 (d, J=8.34 Hz, 1H) 4.56 (s, 2H) 3.92-4.04 (m, 1H) 3.67-3.89 (m, 3H) 3.35-3.49 (m, 1H) 2.34 (s, 3H).

1. customThe cloudy reaction mixture
2. filtrationwas filtered
3. stirringThe mixture was stirred at −20° C. for 15 min.
4. waitat rt for 1 h
5. customThe reaction was quenched with addition of sat. ammonium chloride
6. customOrganic solvent was removed under reduced pressure
7. customThe residue was partitioned between EtOAc/water
8. customThe organic layers were collected
9. washwashed with sat. sodium bicarbonate and brine
10. dry with materialdried over sodium sulfate
11. concentrationconcentrated
12. customThe crude product was purified by flash chromatography (0-40% ethyl acetate/hexanes)
13. concentrationconcentrated

ORD record

ord-cee363439d3743c9b6a676feeea52320

Source dataset

uspto-grants-2015_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09174974B2