Process for producing 2-thia substituted 1,4-diones

Details Process for producing 2-thia substituted 1,4-diones Process for producing 2-thia substituted 1,4-diones

C - Chemistry, Metallurgy

07

C

260/471, 260/570

C07C 148/00 (1980.01) C07C 153/01 (1980.01)

Patent

CA 1040648

ABSTRACT OF THE DISCLOSURE Process for producing 3-thia substituted alkane 1,4 diones comprising the steps of: (i) Providing a 2-ene-1,4 dione having the structure: Image (ii) Intimately admixing said 2-ene-1,4 dione with a sulfur compound having the formula: R3SH thereby providing a substituted or unsubstituted 2-thia substituted alkane 1,4 dione having the structure: Image (iii) Optionally (but only when R3 is acyl or aroyl) hydrolyzing said 2-thia substituted 1,4 dione (in the case where R3 is acyl or aroyl) thereby forming a 3-mercapto substituted alkane 1,4 dione having the structure: Image wherein R3 is either acyl, aroyl, alkyl, tolyl, benzyl or phenyl; wherein R1, R2, R4 and R6 are the same or different and represent hydrogen or lower alkyl. If either or R1 or R2 are hydrogen or both R1 and R2 are hydrogen, then step (ii) is performed in the presence of an organic base such as piperidine, pyridine, triethyl amine, quinoline or .alpha.-picoline.

206047

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