Lawesson's reagent → 1-(2-Chloro-4,6-dimethylphenyl)piperidine-2-thione

HRID 2416100Notes

Reaction equation

[Cl:1][C:2]1[CH:7]=[C:6]([CH3:8])[CH:5]=[C:4]([CH3:9])[C:3]=1[N:10]1[CH2:15][CH2:14][CH2:13][CH2:12][C:11]1=O.COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:26])=CC=1>C1(C)C=CC=CC=1>[Cl:1][C:2]1[CH:7]=[C:6]([CH3:8])[CH:5]=[C:4]([CH3:9])[C:3]=1[N:10]1[CH2:15][CH2:14][CH2:13][CH2:12][C:11]1=[S:26]

Participants

Conditions

Temperature: 80 °C

Procedure

1-(2-Chloro-4,6-dimethylphenyl)piperidin-2-one (18.8 g) and Lawesson's reagent [2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide] (19.2 g) were combined in 150 mL toluene and the mixture was stirred in an 80° C. oil bath for 3 h. The reaction mixture was then cooled to room temperature and filtered. The filtrate was concentrated on the rotary evaporator and the residue was chromatographed on silica gel, eluting with 9:1 hexane/acetone, to provide 19.4 g of 1-(2-chloro-4,6-dimethylphenyl)piperidine-2-thione, mp 146.8-148.0° C.

Workup

temperatureThe reaction mixture was then cooled to room temperature
filtrationfiltered
concentrationThe filtrate was concentrated on the rotary evaporator
customthe residue was chromatographed on silica gel
washeluting with 9:1 hexane/acetone

Sources & evidence

ORD record: ord-a3232c83eaae4a8ebb478b353db734b2
Source dataset: uspto-grants-2004_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06821984B2

Reaction notes

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