(Diethylamino)sulfur trifluoride → Tert-butyl 3-cyano-3-fluoropiperidine-1-carboxylate

HRID 57582Notes

Reaction equation

[C:1]([C:3]1(O)[CH2:8][CH2:7][CH2:6][N:5]([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:4]1)#[N:2].CCN(S(F)(F)[F:23])CC>C(Cl)Cl>[C:1]([C:3]1([F:23])[CH2:8][CH2:7][CH2:6][N:5]([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:4]1)#[N:2]

Participants

Conditions

Temperature: -78 °C

Procedure

To a solution of tert-butyl 3-cyano-3-hydroxypiperidine-1-carboxylate (5.7 g, 25.1 mmol) in DCM (50 mL) cooled to −78° C., DAST (4.85 g, 30.1 mmol) was added drop-wise and the resulting solution stirred at −78° C. for 1 hour. The reaction was warmed to 0° C. and stirred for an additional 1 hour. The reaction mixture was diluted with DCM and quenched with sat. aq. NaHCO3. The combined extracts were dried by Na2SO4, filtered and concentrated in vacuo to afford crude title compound as a pale yellow oil 5.5 g. MS (m/z): 129 (M+H-Boc)+

Workup

temperatureThe reaction was warmed to 0° C.
stirringstirred for an additional 1 hour
customquenched with sat. aq. NaHCO3
dry with materialThe combined extracts were dried by Na2SO4
filtrationfiltered
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-17bb13e6850845719d534d377bf94c81
Source dataset: uspto-grants-2016_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09434726B2

Reaction notes

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