Substituted phenylsulfur trifluoride and other like fluorinating agents
Novel substituted phenylsulfur trifluorides that act as fluorinating agents are disclosed. Also disclosed are methods for their preparation and methods for their use in introducing one or more fluorine atoms into target substrate compounds. Finally, various intermediate compounds for use in preparing substituted phenylsulfur trifluorides are provided.
1. A process for preparing a compound according to formula (Ia):
comprising reacting a compound of formula (Ia-A) with chlorine (Cl 2 ) and an alkali metal fluoride;
in which:
R 1a and R 1b are independently a hydrogen atom; a primary or secondary alkyl group having from one to eight carbon atoms; or a primary, secondary, or tertiary alkyl group having two to eight carbon atoms and at least one ether linkage;
R 2a′ and R 2b′ are independently a hydrogen atom or a halogen atom; and
R 3 is a hydrogen atom; a primary, secondary, or tertiary alkyl group having from one to eight carbon atoms; or a primary, secondary, or tertiary alkyl group having two to eight carbon atoms and at least one ether linkage;
wherein when R 3 is a hydrogen atom, R 1a and R 1b are independently a primary or secondary alkyl group having from one to eight carbon atoms or at least one of R 1a and R 1b is a primary, secondary, or tertiary alkyl group having two to eight carbon atoms and at least one ether linkage, and
wherein, when R 3 is a primary alkyl group having one to eight carbon atoms, at least one of R 1a and R 1b is a primary or secondary alkyl group having from one to eight carbon atoms or a primary, secondary, or tertiary alkyl group having two to eight carbon atoms and at least one ether linkage.
2. The process of claim 1 , wherein the alkali metal fluoride is potassium fluoride or cesium fluoride.
3. The process of claim 1 further comprising a solvent where the solvent is acetonitrile.
4. A process for preparing a compound according to formula (II):
comprising reacting a compound of formula (II-A) with chlorine (Cl 2 ) and an alkali metal fluoride;
in which:
R 1a′ and R 1b′ are independently a hydrogen atom or a primary or secondary alkyl group having from one to eight carbon atoms; and
R 3′ is a hydrogen atom, or a primary, secondary, or tertiary alkyl group having from one to eight carbon atoms;
wherein when R 3′ is a hydrogen atom, R 1a′ and R 1b′ are independently a primary or secondary alkyl group having from one to eight carbon atoms, and wherein, when R 3′ is a primary alkyl group having one to eight carbon atoms, at least one of R 1a′ and R 1b′ is a primary or secondary alkyl group having from one to eight carbon atoms.
5. The process of claim 4 , wherein the alkali metal fluoride is potassium fluoride or cesium fluoride.
6. The process of claim 4 further comprising a solvent where the solvent is acetonitrile.
7. A process for preparing a compound according to formula (Ib):
comprising reacting a compound of formula (Ib-A) with chlorine (Cl 2 ) and an alkali metal fluoride;
in which
R 3′ is a hydrogen atom, or a primary, secondary, or tertiary alkyl group having from one to eight carbon atoms;
R 4 is a primary, secondary, or tertiary alkyl group; and
R 5 and R 6 are independently an alkylene group; the number of total carbon atoms of R 4 , R 5 , and R 6 is eight or less, and m is 0 or 1.
8. The process of claim 7 , wherein the alkali metal fluoride is potassium fluoride or cesium fluoride.
9. The process of claim 7 further comprising a solvent where the solvent is acetonitrile.
10. A process for preparing a compound according to formula (Id):
comprising reacting a compound of formula (Ic) with chlorine (Cl 2 ) and an alkali metal fluoride;
in which
R 7 is a primary, secondary, or tertiary alkyl group having one to four carbon atoms; and R 8 is a hydrogen atom or a primary, secondary, or tertiary alkyl group having one to four carbon atoms.
11. The process of claim 10 , wherein the alkali metal fluoride is potassium fluoride or cesium fluoride.
12. The process of claim 10 further comprising a solvent where the solvent is acetonitrile.