Water → HCID 117761305, compound

HRID 1497539Notes

Reaction equation

[CH2:1]([O:8][C:9]([NH:11][C@H:12]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:13][C:14]1[CH:19]=[CH:18][C:17]([OH:20])=[CH:16][CH:15]=1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(=O)([O-])[O-].[K+].[K+].Br[C:35]([CH3:44])([CH3:43])[C:36]([O:38][C:39]([CH3:42])([CH3:41])[CH3:40])=[O:37].O>CN(C)C=O>[CH2:1]([O:8][C:9]([NH:11][C@H:12]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:13][C:14]1[CH:15]=[CH:16][C:17]([O:20][C:35]([CH3:44])([CH3:43])[C:36]([O:38][C:39]([CH3:42])([CH3:41])[CH3:40])=[O:37])=[CH:18][CH:19]=1)=[O:10])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

Conditions

Temperature: 90 °C

Procedure

To a solution of tert-butyl N-[(benzyloxy)carbonyl]-L-tyrosinate (1.00 g) in N,N-dimethylformamide (10.0 mL) were added potassium carbonate (2.71 g) and tert-butyl 2-bromo-2-methylpropanoate (2.01 mL), followed by stirring at 90° C. overnight. To the reaction suspension was added water, followed by extraction with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane-ethyl acetate) to obtain tert-butyl N-[(benzyloxy)carbonyl]-O-(1-tert-butoxy-2-methyl-1-oxopropan-2-yl)-L-tyrosinate (1.21 g).

Workup

extractionfollowed by extraction with ethyl acetate
dry with materialThe organic layer was dried over anhydrous sodium sulfate
concentrationconcentrated under reduced pressure
customThe residue was purified by silica gel column chromatography (hexane-ethyl acetate)

Sources & evidence

ORD record: ord-49a2870567c040bda990877896af3b05
Source dataset: uspto-grants-2015_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09199927B2

Reaction notes

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