Nitric Acid → HCID 86586349, compound

HRID 1359059Notes

Reaction equation

[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([S:8]([O:11][CH2:12][C@@H:13]2[O:18][C:17]3[CH:19]=[CH:20][C:21]([F:23])=[CH:22][C:16]=3[O:15][CH2:14]2)(=[O:10])=[O:9])=[CH:4][CH:3]=1.[N+:24]([O-])([OH:26])=[O:25]>ClCCCl>[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([S:8]([O:11][CH2:12][CH:13]2[O:18][C:17]3[CH:19]=[C:20]([N+:24]([O-:26])=[O:25])[C:21]([F:23])=[CH:22][C:16]=3[O:15][CH2:14]2)(=[O:10])=[O:9])=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of 19.0 g (56.2 mmole) of {(2R)-6-fluoro-2,3-dihydro-1,4-benzodioxin-2-yl}methyl 4-methylbenzenesulfonate in 200 mL of 1,2-dichloro-ethane in an ice/water bath was added dropwise a solution of 8.35 mL (0.197 mole) of fuming nitric acid (d 1.49) and the mixture was stirred for 2 hours at 0° C. After the reaction was complete, it was quenched with ice and diluted with 500 mL of methylene chloride. After the ice had melted, the organic layer was separated and washed with equal volumes of saturated aqueous sodium bicarbonate and saturated brine, dried over magnesium sulfate, filtered and concentrated in vacuum to a crude yellow solid. This was column chromatographed on silica gel with 1:1 hexane/methylene chloride as eluant to give 18.6 g of the (R)-enantiomer of the title compound as a light yellow solid (m.p. 106-107° C.).

Workup

customit was quenched with ice
additiondiluted with 500 mL of methylene chloride
customthe organic layer was separated
washwashed with equal volumes of saturated aqueous sodium bicarbonate and saturated brine
dry with materialdried over magnesium sulfate
filtrationfiltered
concentrationconcentrated in vacuum to a crude yellow solid
customThis was column chromatographed on silica gel with 1:1 hexane/methylene chloride as eluant

Sources & evidence

ORD record: ord-32018dead2d045248fa236f0058df062
Source dataset: uspto-grants-2003_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06599915B2

Reaction notes

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