Triethylamine → Ethyl 2-diazo-3-(2-fluorophenyl)-3-oxopropanoate

HRID 241995

Reaction equation

[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8](=[O:15])[CH2:9][C:10]([O:12][CH2:13][CH3:14])=[O:11].C(N(CC)CC)C.C(NC1C=CC(S([N:36]=[N+:37]=[N-])(=O)=O)=CC=1)(=O)C>C(#N)C>[N+:36](=[C:9]([C:8]([C:3]1[CH:4]=[CH:5][CH:6]=[CH:7][C:2]=1[F:1])=[O:15])[C:10]([O:12][CH2:13][CH3:14])=[O:11])=[N-:37]

Participants

Conditions

Temperature: 0 °C

Procedure

Ethyl 3-(2-fluorophenyl)-3-oxopropanoate (1.00 g, 4.76 mmol) was dissolved in acetonitrile (14 mL) and treated with triethylamine (0.760 ml, 5.47 mmol, 1.15 equiv). The mixture was cooled to 0° C., treated with 4-acetamidobenzenesulfonylazide (1.26 g, 5.23 mmol, 1.1 equiv) and warmed to ambient temperature over 1.5 hours. The mixture was partially concentrated in vacuo, cooled to 0° C., treated with sodium hydroxide (50 mL, 1 N aqueous) and extracted with chloroform (3×50 mL). The combined organic extracts were dried with sodium sulfate, filtered and concentrated in vacuo. The residue was purified via silica gel gradient chromatography (100:0 to 85:15; hexanes:ethyl acetate) providing the titled compound as a yellow oil.

Workup

temperaturewarmed to ambient temperature over 1.5 hours
concentrationThe mixture was partially concentrated in vacuo
temperaturecooled to 0° C.
additiontreated with sodium hydroxide (50 mL, 1 N aqueous)
extractionextracted with chloroform (3×50 mL)
dry with materialThe combined organic extracts were dried with sodium sulfate
filtrationfiltered
concentrationconcentrated in vacuo
customThe residue was purified via silica gel gradient chromatography (100:0 to 85:15; hexanes:ethyl acetate)

Sources & evidence

ORD record: ord-6ab024c191ed49abb57df564e3e0ab5e
Source dataset: uspto-grants-2014_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08653079B2

Linked notes

Loading…