Reagents and process for direct C—H functionalization
The present invention refers to a process for direct C—H functionalization, the reagents used in the process and the use thereof for the direct C—H functionalization as well as the so-obtained products.
1. Thianthrene derivative of the Formula (I):
wherein at least four of R 1 to R 8 are F or CF 3 , and the others of R 1 to R 8 are hydrogen, and n is 1.
2. Thianthrene derivative of the Formula (I) according to claim 1 wherein R 2 , R 3 , R 6 and R 7 are F or CF 3 and the others of R 1 to R 8 are hydrogen and wherein n is 1.
3. Process for preparing an aromatic or heteroaromatic thianthrenium salt, comprising reacting a monocyclic or polycyclic, aromatic or heteroaromatic hydrocarbon Ar, which may be substituted or unsubstituted, with an activated thianthrene derivative of the Formula (I) according to claim 1 or mixtures thereof in an organic solvent whereby a thianthrenium salt of the Formula (III) is obtained:
wherein at least four of R 1 to R 8 are F or CF 3 , and the others of R 1 to R 8 are hydrogen, and n is 1, RX is selected from HBF 4 ; HBF 4 OEt 2 , BF 3 OEt 2 , trifluoro methane sulfonic acid (triflic acid), triflic acid anhydride, trifluoro acetic acid, trifluoro acetic acid anhydride, trimethylsilyltriflate and X − is an anion derived from RX.
4. Process for preparing a thianthrenium salt compound of the Formula (III) according to claim 3 , wherein the thianthrene derivative of the Formula (I) is activated by adding a carboxylic acid anhydride if n=1 in formula (I).
5. Process for preparing a thianthrenium salt of the Formula (III) according to claim 4 , wherein the reaction is carried out in the presence of a Bronstedt acid or Lewis acid.
6. Process for preparing a thianthrenium salt of the Formula (III) according to claim 3 , wherein the thianthrene derivative of the Formula (I) is activated by oxidation if n=0 in formula (I).
7. Process for preparing a thianthrenium salt of the Formula (III) according to claim 6 , wherein the thianthrene derivative of the Formula (I) is activated by oxidation with 1-Chloromethyl-4-fluoro-1,4-diazonia bicyclo[2.2.2]octane bis(tetrafluoroborate).
8. Process for preparing a thianthrenium salt of the Formula (III) according to claim 6 , wherein the thianthrene derivative of the Formula (I) is activated by electrochemical oxidation.
9. Process for preparing a thianthrenium salt of the Formula (III) according to claim 3 which comprises reacting an electron-poor Ar and a thianthrene derivative of the Formula (I) or a mixture of different thianthrene derivatives of the Formula (I), wherein R 2 , R 3 , R 6 and R 7 are F or CF 3 and the others of R 1 to R 8 are hydrogen and wherein n is 1.
10. Process for preparing an aromatic or heteroaromatic thianthrenium salt according to claim 3 , which comprises reacting an electron-rich Ar and a thianthrene derivative of the Formula (I) or a mixture of different thianthrene derivatives of the Formula (I), wherein at least four of R 1 to R 8 are F or CF 3 , and the others of R 1 to R 8 are hydrogen, and n is 1.