Phthalimide → 2-[3-(Boc-amino)-1-phenylpropyl]isoindoline-1,3-dione

HRID 1186504Notes

Reaction equation

[C:1]([O:5][C:6](=[O:18])[NH:7][CH2:8][CH2:9][CH:10](O)[C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)([CH3:4])([CH3:3])[CH3:2].[C:19]1(=[O:29])[NH:23][C:22](=[O:24])[C:21]2=[CH:25][CH:26]=[CH:27][CH:28]=[C:20]12.C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.CCOC(/N=N/C(OCC)=O)=O>C1COCC1>[C:1]([O:5][C:6](=[O:18])[NH:7][CH2:8][CH2:9][CH:10]([N:23]1[C:19](=[O:29])[C:20]2[C:21](=[CH:25][CH:26]=[CH:27][CH:28]=2)[C:22]1=[O:24])[C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)([CH3:4])([CH3:3])[CH3:2]

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of (3-hydroxy-3-phenyl-propyl)-carbamic acid tert-butyl ester (10.4 g, 41.4 mmol), phthalimide (5.2 g, 36.6 mmol), and PPh3 (14.6 g, 55.5 mmol) in THF (204 mL) was added dropwise DEAD (8.9 mL, 55 mmol) with stirring at 0° C. Then the resulting mixture was warmed to room temperature for an additional 2 hours. The mixture was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (petroleum ether:ethyl acetate, 3:1) to give [3-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-3-phenyl-propyl]-carbamic acid tert-butyl ester. (Yield 10.5 g, 66.8%). 1H NMR (300 MHz, CDCl3): δ 7.81-7.75 (m, 2H), 7.69-7.64 (m, 2H), 7.53-7.50 (m, 2H), 7.34-7.23 (m, 3H), 5.44-5.38 (m, 1H), 4.74 (brs, 1H), 3.29-3.07 (m, 2H), 2.83-2.75 (m, 1H), 2.51-2.42 (m, 1H), 1.42 (s, 9H). LC-MS: [M-Boc+H]+ 281.

Workup

temperatureThen the resulting mixture was warmed to room temperature for an additional 2 hours
concentrationThe mixture was concentrated under reduced pressure
customThe residue was purified by column chromatography on silica gel (petroleum ether:ethyl acetate, 3:1)

Sources & evidence

ORD record: ord-5876593993fe4c0a90a3166eec6b74ec
Source dataset: uspto-grants-2014_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08673905B2

Reaction notes

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