2-Chloroethanol → 2-Hydroxyethyl-3-benzyl-2-oxo-1,2,5,6,7,8-hexahydroquinoxaline

HRID 1904334Notes

Reaction equation

[CH2:1](Cl)[CH2:2][OH:3].[OH:5][C:6]1[C:15]([CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)=[N:14][C:13]2[CH2:12][CH2:11][CH2:10][CH2:9][C:8]=2[N:7]=1.[OH-].[Na+]>C(O)(C)(C)C>[OH:3][CH2:2][CH2:1][N:7]1[C:8]2[CH2:9][CH2:10][CH2:11][CH2:12][C:13]=2[N:14]=[C:15]([CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[C:6]1=[O:5]

Participants

Conditions

Temperature: 60 °C

Procedure

Ethylene chlorohydrin (16.10 g, 0.2M) was added to a solution of 2-hydroxy-3-benzyl-5,6,7,8-tetrahydro quinoxaline (9.60 g, 40 mM) in dilute aqueous 5N NaOH (40 ml) and t-butanol (120 ml), and stirred at 60° C. for 3 hours. The t-butanol was distilled off in vacuo. The residue was extracted three times with chloroform, dried with anhydrous sodium sulfate and concentrated in vacuo. The residue was charged on a column of silica-gel (C-200, 220 g) packed with chloroform, and eluted with chloroform-methanol (200:1) to obtain compound 643 (10.90 g, yield: 83.8%).

Workup

distillationThe t-butanol was distilled off in vacuo
extractionThe residue was extracted three times with chloroform
dry with materialdried with anhydrous sodium sulfate
concentrationconcentrated in vacuo
additionThe residue was charged on a column of silica-gel (C-200, 220 g)
washeluted with chloroform-methanol (200:1)

Sources & evidence

ORD record: ord-5464bc85205740ba8ddc5000824b2510
Source dataset: uspto-grants-1989_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04837319

Reaction notes

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