Sodium borohydride → HCID 71116109, compound

To a light green 0° C. solution of 7-(azidomethyl)-7-methyl-3-neopentyl-1-oxa-3-azaspiro[4.5]decan-2-one (10.0 g, 34.0 mmol) and nickel (II) chloride hexahydrate (8.07 g, 34.0 mmol) in MeOH (226 mL) was added sodium borohydride (1.93 g, 51.0 mmol) in six portions. The reaction quickly became black and was allowed to stir at 0° C. for 3 h. The reaction mixture was concentrated and partitioned between 1 N NaOH (350 mL) and EtOAc (350 mL). The biphasic mixture was filtered through celite, and the layers were separated. The aqueous layer was extracted with EtOAc (2×150 mL). The combined organics were dried over MgSO4, filtered, and concentrated to afford the title compound (8.65 g, 90% crude yield) as a light yellow solid. 1H NMR (400 MHz, CDCl3) δ 3.33 (dd, J=8.53, 13.80 Hz, 2H), 3.06 (d, J=14.05 Hz, 1H), 2.93 (d, J=14.05 Hz, 1H), 2.43 (s, 2H), 1.99 (dt, J=1.76, 13.55 Hz, 1H), 1.89 (dt, J=3.48, 13.87 Hz, 1H), 1.69 (d, J=14.05 Hz, 1H), 1.57 (dt, J=4.11, 13.87 Hz, 1H), 1.29-1.47 (m, 3H), 1.15-1.28 (m, 1H), 1.08 (s, 3H), 0.96 (s, 9H).

1. customThe reaction quickly became black
2. concentrationThe reaction mixture was concentrated
3. custompartitioned between 1 N NaOH (350 mL) and EtOAc (350 mL)
4. filtrationThe biphasic mixture was filtered through celite
5. customthe layers were separated
6. extractionThe aqueous layer was extracted with EtOAc (2×150 mL)
7. dry with materialThe combined organics were dried over MgSO4
8. filtrationfiltered
9. concentrationconcentrated

ORD record

ord-2473b4b2f8c945429703d353ae5f481d

Source dataset

uspto-grants-2015_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08927585B2