Phthalimide → 2-(4-(Pyridin-2-yl)but-3-ynyl)isoindoline-1,3-dione

HRID 334528Notes

Reaction equation

[N:1]1[CH:6]=[CH:5][CH:4]=[CH:3][C:2]=1[C:7]#[C:8][CH2:9][CH2:10]O.[C:12]1(=[O:22])[C:20]2[C:15](=[CH:16][CH:17]=[CH:18][CH:19]=2)[C:14](=[O:21])[NH:13]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CC(OC(/N=N/C(OC(C)(C)C)=O)=O)(C)C>C(Cl)Cl.C1COCC1>[N:1]1[CH:6]=[CH:5][CH:4]=[CH:3][C:2]=1[C:7]#[C:8][CH2:9][CH2:10][N:13]1[C:14](=[O:21])[C:15]2[C:20](=[CH:19][CH:18]=[CH:17][CH:16]=2)[C:12]1=[O:22]

Participants

Conditions

Temperature: 0 °C

Procedure

4-(Pyridin-2-yl)but-3-yn-1-ol (96 mg, 0.65 mmol), isoindoline-1,3-dione (140 mg, 0.97 mmol) and triphenylphosphine polymer bound 3 mmol/g (340 mg, 1.02 mmol) were dissolved in DCM (2 mL) and cooled to 0° C. Di-tert-butylazodicarboxylate (226 mg, 0.96 mmol) dissolved in DCM (0.5 mL) was added dropwise over 30 min. to the reaction mixture followed by THF (0.5 mL) and the reaction mixture was stirred for 16 h at room temperature. After filtration through celite, the organic phase was washed with a solution of NH4OH, brine, dried over Na2SO4, filtered and concentrated. The crude residue was purified by flash chromatography (cyclohexane/AcOEt 3:7) to yield 130 mg (0.47 mmol, 73%) of 2-(4-(pyridin-2-yl)but-3-ynyl)isoindoline-1,3-dione as an orange solid.

Workup

additionwas added dropwise over 30 min. to the reaction mixture
filtrationAfter filtration through celite
washthe organic phase was washed with a solution of NH4OH, brine
dry with materialdried over Na2SO4
filtrationfiltered
concentrationconcentrated
customThe crude residue was purified by flash chromatography (cyclohexane/AcOEt 3:7)

Sources & evidence

ORD record: ord-f0146874d1eb4dcaa09b9b791a2f3dd0
Source dataset: uspto-grants-2014_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08883826B2

Reaction notes

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