1,8-Diazabicyclo(5.4.0)undec-7-ene → 1-(6-Bromo-7-hydroxy-2-benzothiazolyl)-3-ethylurea

HRID 9108

Reaktionsgleichung

[Br:1][C:2]1(Br)[CH2:16][CH2:15][C:5]2[N:6]=[C:7]([NH:9][C:10]([NH:12][CH2:13][CH3:14])=[O:11])[S:8][C:4]=2[C:3]1=[O:17].C1CCN2C(=NCCC2)CC1>C1COCC1>[Br:1][C:2]1[CH:16]=[CH:15][C:5]2[N:6]=[C:7]([NH:9][C:10]([NH:12][CH2:13][CH3:14])=[O:11])[S:8][C:4]=2[C:3]=1[OH:17]

Komponenten

Reaktionsbedingungen

Temperatur: 20 °C

Versuchsvorschrift

A suspension of 1-(6,6-dibromo-7-oxo-4,5,6,7-tetrahydro-2-benzothiazolyl)-3-ethyl-urea 5 (7.78 g, 19.6 mmol) in THF (50 mL) was treated with DBU (8.79 mL, 58.8 mmol, 3.0 eq) dropwise at about 20° C. A dark green suspension was obtained while heat was generated upon addition of DBU. It was stirred at about 20° C. for about 18 hours. The reaction mixture was concentrated and the residue was treated with saturated NH4Cl (aq) solution to neutral. A light brown colored precipitate was obtained. It was filtered off and washed with H2O (2×50 mL), small amount of MeOH and CH2Cl2, and finally dried under vacuum to give 4.83 g (78%) of the desired compound 6. 1H NMR (DMSO) δ 10.68 (br s, 1H, NH), 7.43 (d, 1H, J=8.5 Hz, ArH), 7.08 (d, 1H, J=8.5 Hz, ArH), 6.70 (br s, 1H, NH), 3.18 (m, 2H, CH2), 1.09 (t, 3H, J=7.2 Hz, CH3). LC/MS 316 (MH+); RP-HPLC RT 2.80 minutes.

Aufarbeitung

customA dark green suspension was obtained
temperaturewhile heat
concentrationThe reaction mixture was concentrated
additionthe residue was treated with saturated NH4Cl (aq) solution to neutral
customA light brown colored precipitate was obtained
filtrationIt was filtered off
washwashed with H2O (2×50 mL), small amount of MeOH and CH2Cl2
customfinally dried under vacuum

Quellen und Nachweise

ORD-Eintrag: ord-4f2e74aefc354a3f8e93f452a584a7ad
Quelldatensatz: uspto-grants-2006_08
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US07091227B2

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