Tetrabutylammonium Fluoride → HCID 44200307, compound

Participants

Reaction Steps

To a 25 mL round bottom flask equipped with a magnetic stirrer and a septum was added 4-((1R,2S)-2-(tert-butyldimethylsilyloxy)-1-(5-(3-(tert-butyldimethyl-silyloxy)phenyl)-1,3,4-oxadiazol-2-yl)propylamino)-2-chloro-3-methylbenzonitrile (intermediate 7c) (62 mg, 0.1 mmol), which was then dissolved in anhydrous THF (3 mL) under an atmosphere of nitrogen. To this was added the tetrabutylammonium fluoride as a 1M solution in THF (0.4 mL, 0.4 mmol) producing an instant color change to yellow. This was allowed to stir at room temperature for a period of 4 h. The solvent was then removed under reduced pressure to yield a black residue. This residue was taken up in EtOAc (20 mL) and washed with water (2×10 mL), brine (1×10 mL) and dried over Na2SO4. The solution was then filtered and concentrated under reduced pressure using rotary evaporation to reveal a yellow solid. This was purified via silica gel chromatography eluted with 70% EtOAc/hexanes to provide the title compound as a white solid (31 mg, 81%). 1H NMR (500 MHz, acetone-d6, δ in ppm) 8.88 (br s, 1H), 7.48 (m, 3H), 7.38 (m, 1H), 7.06 (m, 1H), 6.86 (d, J=8.8 Hz, 1H), 5.68 (d, J=8.5 Hz, 1H), 5.10 (dd, J=3.6, 8.5 Hz, 1H), 4.83 (br s, 1H), 4.62 (m, 1H), 2.40 (s, 3H), 1.41 (d, J=6.3 Hz, 3H).

Provenance & Evidence