Selectfluor → (S)-ethyl 2-tert-butoxy-2-(6-chloro-4-fluoro-1-hydroxy-3-methylnaphthalen-2-yl)acetate

HRID 926147Notes

Reaction equation

[C:1]([O:5][C@@H:6]([C:12]1[C:21]([CH3:22])=[CH:20][C:19]2[C:14](=[CH:15][CH:16]=[C:17]([Cl:23])[CH:18]=2)[C:13]=1[OH:24])[C:7]([O:9][CH2:10][CH3:11])=[O:8])([CH3:4])([CH3:3])[CH3:2].[B-](F)(F)(F)[F:26].[B-](F)(F)(F)F.C1[N+]2(CCl)CC[N+](F)(CC2)C1>C(#N)C>[C:1]([O:5][C@@H:6]([C:12]1[C:21]([CH3:22])=[C:20]([F:26])[C:19]2[C:14](=[CH:15][CH:16]=[C:17]([Cl:23])[CH:18]=2)[C:13]=1[OH:24])[C:7]([O:9][CH2:10][CH3:11])=[O:8])([CH3:2])([CH3:4])[CH3:3]

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of (S)-ethyl 2-tert-butoxy-2-(6-chloro-1-hydroxy-3-methylnaphthalen-2-yl)acetate (0.9705 g, 2.77 mmol) in anhydrous acetonitrile (20 mL) at 0° C. was added SelectFluor (1.078 g, 3.04 mmol) in one portion. The reaction mixture was stirred for 4 hours at 0° C., then 1 hour at room temperature. The reaction mixture was quenched with saturated Na2HPO4 solution and stirred for 20 minutes. The mixture was extracted with ethyl acetate (2×), dried (MgSO4), filtered, concentrated and stored overnight in a freezer. The residue was purified by flash column chromatography (silica gel, 0 to 15% ethyl acetate/hexanes) to give the desired product. LCMS-ESI+ (m/z): [M+H]+ calcd for C19H21ClFO4: 367.8. Found: 366.9, 368.9.

Workup

custom1 hour
customat room temperature
customThe reaction mixture was quenched with saturated Na2HPO4 solution
stirringstirred for 20 minutes
extractionThe mixture was extracted with ethyl acetate (2×)
dry with materialdried (MgSO4)
filtrationfiltered
concentrationconcentrated
waitstored overnight in a freezer
customThe residue was purified by flash column chromatography (silica gel, 0 to 15% ethyl acetate/hexanes)

Sources & evidence

ORD record: ord-b5a4f4c8128e47b2adc771c45f8973c5
Source dataset: uspto-grants-2016_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09284323B2

Reaction notes

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