11-Bromoundecanoic acid → 11-Azidoundecanoic acid

HRID 1780688

Reaction equation

Br[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][C:12]([OH:14])=[O:13].[N-:15]=[N+:16]=[N-:17].[Na+]>CN(C)C=O.O>[N:15]([CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][C:12]([OH:14])=[O:13])=[N+:16]=[N-:17]

Participants

Conditions

Temperature: 80 °C

Procedure

To 11-bromoundecanoic acid (1.73 g) dissolved in N,N-dimethylformamide (DMF) was added sodium azide (1.5 g), and the mixture was heated to a temperature of 80° C. and stirred for 5 hours. The reaction mixture was then diluted with cooling water and extracted with ethyl acetate to give 11-azidoundecanoic acid. To the mixed solution of 11-azidoundecanoic acid (1 g) and para-nitrophenol (612 mg) in DMF was added N,N'-dicyclohexylcarbodiimide (920 mg), and the mixture was stirred for 12 hours. The reaction mixture was filtered and concentrated to give the active ester of 11-azidoundecanoic acid. To the active ester (284 mg) dissolved in DMF were further added 6-(4'-N-glycyl-spicaminyl-amino)purine hydrochloride (300 mg) and triethylamine (1.1 ml), and the mixture was stirred for 12 hours. The solvent was removed by distillation, and the residue was subjected to chromatography on a silica gel column with eluent systems of chloroform-methanol (from 7:1 to 5:1) to give SPK410 in the yield of 171 mg.

Workup

extractionextracted with ethyl acetate

Sources & evidence

ORD record: ord-46a8ad6f74ec4449853b23d1e6591afc
Source dataset: uspto-grants-1997_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05631238

Linked notes

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