Triphenylphosphine → 4-[(triphenylphosphoranylidene)amino]-5-ethoxy-5H-furan-2-one

HRID 2215964Notes

Reaction equation

[N:1]([C:4]1[CH:8]([O:9][CH2:10][CH3:11])[O:7][C:6](=[O:12])[CH:5]=1)=[N+]=[N-].[C:13]1([P:19]([C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1>C1(C)C=CC=CC=1.C(OCC)(=O)C>[C:26]1([P:19](=[N:1][C:4]2[CH:8]([O:9][CH2:10][CH3:11])[O:7][C:6](=[O:12])[CH:5]=2)([C:13]2[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=2)[C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=1

Participants

Conditions

Temperature: 65 °C

Procedure

A solution of 4-azido-5-ethoxy-5H-furan-2-one (0.17 g, 1.0 mmol) and triphenylphosphine (0.26 g, 1.0 mmol) in toluene (5 mL) at room temperature under nitrogen was stirred for 1 h, then heated at 60-70° C. for 8 h. The reaction was cooled, was diluted with ethyl acetate, was washed with sodium bisulfate, sodium bicarbonate and brine, was dried over sodium sulfate and was evaporated. Purification by flash chromatography (SiO2) eluted with 1:1 ethyl acetate:hexanes afforded 4-[(triphenylphosphoranylidene)amino]-5-ethoxy-5H-furan-2-one (0.18 g, 45% yield) as an off-white solid. 1H-NMR (500 MHz, CDCl3) δ 7.73 (m, 6H), 7.65 (m, 3H), 7.55• (m, 6H), 5.58 (s, 1H), 4.33 (s, 1H), 3.81 (m, 1H), 3.64 (s, 1H), 1.27 (t, J=7.1 Hz, 3H) ppm. MS (ES+) m/e=404 (M+H).

Workup

temperatureThe reaction was cooled
washwas washed with sodium bisulfate, sodium bicarbonate and brine
dry with materialwas dried over sodium sulfate
customwas evaporated
customPurification by flash chromatography (SiO2)
washeluted with 1:1 ethyl acetate

Sources & evidence

ORD record: ord-61055952b38041c7b945850a4e0e5f71
Source dataset: uspto-grants-2006_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07109357B2

Reaction notes

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