Hydrogen Sulfide → 5,6,7,8-Tetrahydro-3-methyl-8-quinolinecarbothioamide

HRID 436481Notes

Reaction equation

[CH3:1][C:2]1[CH:3]=[N:4][C:5]2[CH:6]([C:12]([NH2:14])=O)[CH2:7][CH2:8][CH2:9][C:10]=2[CH:11]=1.S.P12(SP3(SP(SP(S3)(S1)=S)(=S)S2)=S)=[S:17]>N1C=CC=CC=1>[CH3:1][C:2]1[CH:3]=[N:4][C:5]2[CH:6]([C:12](=[S:17])[NH2:14])[CH2:7][CH2:8][CH2:9][C:10]=2[CH:11]=1

Participants

Conditions

Temperature: 0 °C

Procedure

A solution of 3-methyl-5,6,7,8-tetrahydroquinoline-8-carboxamide (27.9 g. 0.14 m) in dry pyridine (300 ml.), saturated with H2S gas, was treated with P2S5 (26 g., 0.14 m) and heated at reflux for 45 min. whilst maintaining a slow stream of H2S gas. The reaction mixture was evaporated to dryness in vacuo and cooled to 0° C, made alkaline with 10% sodium hydroxide and the solution extracted with chloroform (3 × 100 ml.). The combined extracts were washed with brine, dried and evaporated in vacuo. The residual oil was triturated with benzene and the solid filtered and recrystallised from benzene to give the title compound as pale yellow needles m.p. 149° (21.8 g., 87%). The hydrochloride was prepared as already described in Example 18 and isolated as colourless needles m.p. 219° C.

Workup

temperatureheated
temperatureat reflux for 45 min.
customThe reaction mixture was evaporated to dryness in vacuo
extractionthe solution extracted with chloroform (3 × 100 ml.)
washThe combined extracts were washed with brine
customdried
customevaporated in vacuo
customThe residual oil was triturated with benzene
filtrationthe solid filtered
customrecrystallised from benzene

Sources & evidence

ORD record: ord-f78ea2a4d01340ce93a69629bb02d87f
Source dataset: uspto-grants-1977_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04009169

Reaction notes

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