Method for synthesis of 2,5-dioxane-1,4-diones
View Patent ↗The invention relates to a novel method for the synthesis of 2,5-dioxane-1,4-diones having formula (I), comprising the oxidation of the ketone function of a cyclic compound having formula (II), wherein R 1 , R 2 , R 3 and R 4 independently represent the hydrogen atom, halo, (C 2 -C 6 ) alkenyl, (C 3 -C 7 )cycloalkyl, cyclohexenyl and a radical having formula —(CH 2 ) m —V—W.
1. Process for the preparation of 2,5-dioxane-1,4-diones of formula (I)
in which R 1 , R 2 , R 3 and R 4 are, independently, a hydrogen atom; halo; (C 2 -C 6 ) alkenyl; (C 3 -C 7 ) cycloalkyl; cyclohexenyl; or a radical of formula —(CH 2 ) m —V—W; wherein
V is a covalent bond, an oxygen atom or a —C(O)—O— radical;
W is a hydrogen atom, a (C 1 -C 18 ) alkyl radical optionally substituted by one or more identical or different halo radicals; an aryl or aralkyl radical, the aryl and aralkyl radicals being optionally substituted by one or more identical or different substituents including: —(CH 2 ) n —Y-Z, halo, nitro or cyano;
Y is —O—, —S— or a covalent bond;
Z is a hydrogen atom or a (C 1 -C 6 ) alkyl radical optionally substituted by one or more identical or different halo radicals; or aralkyl;
m and n are independently an integer from 0 to 4;
comprising oxidizing the ketone function of a cyclic compound of formula (II)
in which R 1 , R 2 , R 3 and R 4 are defined above, wherein the oxidizing is carried out in the presence of a peracid as an oxidizing agent and in the presence of a sulfonic acid as a catalyst.
2. Preparation process according to claim 1 , wherein the oxidizing agent is metachloroperbenzoic acid.
3. Preparation process according to claim 2 , wherein the oxidizing agent is used in the presence of trifluoromethanesulfonic acid.
4. Preparation process according to claim 1 , wherein the aryl radical is a phenyl radical and the aralkyl radical is a benzyl radical.
5. Preparation process according to claim 1 , wherein R 1 , R 2 , R 3 and R 4 are, independently, a hydrogen atom or a radical of formula —(CH 2 ) m —V—W, wherein V is a covalent bond and W is a (C 1 -C 6 ) alkyl radical.
6. Preparation process according to claim 1 , wherein R 1 , R 2 , R 3 and R 4 are, independently, a hydrogen atom, a methyl or ethyl radical.
7. Preparation process according to claim 1 , wherein R 1 and R 2 are, independently, a radical of formula —(CH 2 ) m —V—W, wherein V is a covalent bond, m=0 and W is a (C 1 -C 6 ) alkyl radical, and R 3 and R 4 are, independently, a hydrogen atom or a radical of formula —(CH 2 ) m —V—W, wherein V is a covalent bond, m=0 and W is a (C 1 -C 6 ) alkyl radical.
8. Preparation process according to claim 1 , wherein R 1 and R 2 are, independently, a methyl or ethyl radical, and R 3 and R 4 are, independently, a hydrogen atom, a methyl or ethyl radical.