Phosphorus sulfide (P2S5) → HCID 20059996, compound
Reaction equation
[CH:1]1[C:13]2[NH:12][C:11]3[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=3)[C:5]=2[CH:4]=[C:3]([C:14]([NH2:16])=O)[N:2]=1.P12(SP3(SP(SP(S3)(S1)=S)(=S)S2)=S)=[S:18]>N1C=CC=CC=1>[CH:1]1[C:13]2[NH:12][C:11]3[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=3)[C:5]=2[CH:4]=[C:3]([C:14](=[S:18])[NH2:16])[N:2]=1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
A stirred mixture of 5.0 g of β-carbolin-3-carboxamide dissolved in 100 ml of dry pyridine and 5.0 g of phosphorus pentasulfide is boiled under reflux for 4 hours. The cooled reaction mixture is concentrated to about 25 ml in vacuo and poured into 1 liter of ice water. After adjusting the pH of the mixture to 8.5 with aqueous ammonia, a solid is filtered off, washed thoroughly with water and dried. The substance formed (3.2 g) is recrystallized from n-butyl alcohol to form β-carbolin-3-carbothioamide of a melting point of 274°-276° C.