Pyridine → 2-Methyl-2-(3-(phenoxycarbonylamino)isoxazol-5-yl)propyl 4-nitrobenzenesulfonate

HRID 631624Notes

Reaction equation

[OH:1][CH2:2][C:3]([C:6]1[O:10][N:9]=[C:8]([NH:11][C:12](=[O:20])[O:13][C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[CH:7]=1)([CH3:5])[CH3:4].N1C=CC=CC=1.[N+:27]([C:30]1[CH:35]=[CH:34][C:33]([S:36](Cl)(=[O:38])=[O:37])=[CH:32][CH:31]=1)([O-:29])=[O:28]>ClCCl>[N+:27]([C:30]1[CH:31]=[CH:32][C:33]([S:36]([O:1][CH2:2][C:3]([CH3:4])([C:6]2[O:10][N:9]=[C:8]([NH:11][C:12]([O:13][C:14]3[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=3)=[O:20])[CH:7]=2)[CH3:5])(=[O:38])=[O:37])=[CH:34][CH:35]=1)([O-:29])=[O:28]

Participants

Conditions

Temperature: 35 °C

Procedure

To a stirred solution of phenyl 5-(1-hydroxy-2-methylpropan-2-yl)isoxazol-3-ylcarbamate (prepared as described in Example 131A steps 1 through 4) (250 mg, 0.91 mmol) and pyridine (0.15 mL, 1.81 mmol) in dichloromethane (5 mL) at 0° C., was added dropwise, 4-nitrophenylsulfonyl chloride (245 mg, 1.08 mmol) in dichloromethane (3 mL). The reaction mixture was warmed to 35° C. and stirred for a further 15 h. Concentration under reduced pressure gave the crude product which was purified via silica gel column chromatography (eluting with 20% ethyl acetate in petroleum ether) to afford 2-methyl-2-(3-(phenoxycarbonylamino)isoxazol-5-yl)propyl 4-nitrobenzenesulfonate (250 mg, 60%) as a yellow solid. 1H NMR (400 MHz, CDCl3) 88.36-8.39 (m, 2H), 8.01-8.03 (m, 2H), 7.88 (m, 1H), 7.43-7.45 (m, 2H), 7.21-7.31 (m, 3H), 6.54 (s, 1H), 4.19 (s, 2H), 1.38 (s, 6H).

Workup

concentrationConcentration under reduced pressure
customgave the crude product which
customwas purified via silica gel column chromatography (eluting with 20% ethyl acetate in petroleum ether)

Sources & evidence

ORD record: ord-8d343912123e452eb76dd3baea306660
Source dataset: uspto-grants-2016_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09320739B2

Reaction notes

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