N-Hydroxyphthalimide → tert-Butyl {(1S)-2-[(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)oxy]-1-methylethyl}carbamate

HRID 330925Notes

Reaction equation

[OH:1][CH2:2][C@@H:3]([NH:5][C:6](=[O:12])[O:7][C:8]([CH3:11])([CH3:10])[CH3:9])[CH3:4].O[N:14]1[C:18](=[O:19])[C:17]2=[CH:20][CH:21]=[CH:22][CH:23]=[C:16]2[C:15]1=[O:24].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C>C1COCC1>[O:24]=[C:15]1[C:16]2[C:17](=[CH:20][CH:21]=[CH:22][CH:23]=2)[C:18](=[O:19])[N:14]1[O:1][CH2:2][C@@H:3]([NH:5][C:6](=[O:12])[O:7][C:8]([CH3:11])([CH3:10])[CH3:9])[CH3:4]

Participants

Conditions

Temperature: 0 °C

Procedure

To a mixture of tert-butyl [(1S)-2-hydroxy-1-methylethyl]carbamate 57 (4.03 g, 23.0 mmol), N-hydroxyphthalimide (5.63 g, 34.5 mmol) and triphenylphosphine (9.05 g, 34.5 mmol) in anhydrous THF (172 mL) at 0° C. under nitrogen was added DIAD (6.69 mL, 34.5 mmol) in anhydrous THF (40 mL) over 15 minutes. The mixture was stirred at 0° C. for 30 min and at room temperature for 2.5 h. Solvent was evaporated off and the residue was subjected to chromatography to give a white solid 58 (7.38 g).

Workup

customSolvent was evaporated off

Sources & evidence

ORD record: ord-4ff52c8cbe234d02a3118cf472748237
Source dataset: uspto-grants-2014_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08877743B2

Reaction notes

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