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US 2019/0161458 A1Published application
Aryl halide cross-coupling method and product made therefrom
AssigneeKing Fahd University of Petroleum and Minerals
InventorsBassam EL ALI, Rami Khalid SULEIMAN, Mansur Bala IBRAHIM
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Abstract
A solid-supported catalyst ligand which chelates palladium (II) species to form a complex that functions as a heterogeneous catalyst that is stable and can be recycled without significantly losing any catalytic activity in a variety of chemical transformations, a method for producing the solid-supported catalyst ligand and a method for catalyzing a palladium cross-coupling reaction, such as the Suzuki-Miyaura, Mizoroki-Heck, and Sonagashira reactions.
Claims8
1-13. (canceled)
14:
- An aryl halide cross-coupling method, comprising:
- reacting the aryl halide with a compound comprising at least one of a boronic acid, a terminal alkyne, and an alkene in the presence of a solvent, a base, and a solid-supported catalyst to form a palladium cross-coupling product,
- wherein the solid-supported catalyst, comprises:
- a catalytic metal in the form of a Pd+2 species having the formula PdZ2, wherein Z is selected from the group consisting of —Cl, —I, —Br, —OAc and —OTf, and
- a solid-supported ligand of formula (I)
- wherein the nitrogen atoms of the two oxazoline heterocycles of the solid-supported ligand chelate the catalytic metal;
- and
- wherein R1, R2, R3 and R4 are independently —H, an optionally substituted alkyl, an optionally substituted cycloalkyl, or an optionally substituted aryl;
- each R5 and R6 is independently —H, an optionally substituted alkyl, an optionally substituted cycloalkyl, or an optionally substituted aryl;
- X is O, NH, or S;
- and
- wherein SS is a solid resin bead with the proviso that the solid resin bead is not silica.
9 more elements
15:
- The method of claim 14, wherein
- each R1 and R2 is —CH3;
- each R3, R4, R3, and R6 is —H;
- X is O;
- and
- the Pd+2 species having the formula PdZ2 is PdCl2.
3 more elements
16:
- The method of claim 14, further comprising:
- separating the solid-supported catalyst from the palladium cross-coupling product to recover the solid-supported catalyst;
- and
- reusing the solid-supported catalyst in at least 2 reaction cycles with a less than 10% decrease in at least one selected from the group consisting of a turnover number and a turnover frequency.
1 more element
17:
- The method of claim 14, wherein a molar yield of the palladium cross-coupling product is at least 75% relative to an initial molar amount of the aryl halide.
(canceled)
19:
- The method of claim 14, wherein the palladium cross-coupling product comprises less than 100 ppb palladium, based on the total weight of the palladium cross-coupling product or derivatives thereof.
(canceled)
Dependencies are inferred from the claim text.