Lawesson's reagent → 6-bromo-7-chloro-3,4-dihydroquinoline-2(1H)-thione

HRID 1521635Notes

Reaction equation

[Br:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][C:11]=1[Cl:12])[NH:8][C:7](=O)[CH2:6][CH2:5]2.COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:23])=CC=1>C1(C)C=CC=CC=1>[Br:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][C:11]=1[Cl:12])[NH:8][C:7](=[S:23])[CH2:6][CH2:5]2

Participants

Conditions

Temperature: 100 °C

Procedure

To a stirred solution of 6-bromo-7-chloro-3,4-dihydroquinolin-2(1H)-one (110-2; 2.95 g, 0.0113 mol) in toluene (50 mL) was added Lawesson's reagent (2.2 g, 0.00566 mol). Reaction mass was refluxed at 100° C. for 3 h. The reaction mixture was concentrated under reduced pressure and the residue was purified by silica gel (60-120 mesh) column chromatography using 7% ethyl acetate in hexane to afford the title compound. 1H NMR (400 MHz, DMSO-d6) δ 12.25 (s, 1H), 7.64 (s, 1H), 7.24 (s, 1H), 2.93-2.89 (t, J=6.8 Hz, 2H), 2.80-2.76 (t, J=8.0 Hz, 2H); MS (M+1): 275.8.

Workup

customReaction mass
concentrationThe reaction mixture was concentrated under reduced pressure
customthe residue was purified by silica gel (60-120 mesh) column chromatography

Sources & evidence

ORD record: ord-6f317c2d7398443d85b990cdfc44f000
Source dataset: uspto-grants-2015_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09073929B2

Reaction notes

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