Methods of isolating 4-chloro-2-fluoro-3-substituted-phenylboronic acids
First Claim
1. A method of isolating a 4-chloro-2-fluoro-3-methoxyphenyl-boronic acid, comprising:
- saturating a mixture of water, acetonitrile, and a 4-chloro-2-fluoro-3-methoxyphenyl-boronic acid with a salt to form an acetonitrile layer and a water layer;
partitioning the 4-chloro-2-fluoro-3-methoxyphenyl-boronic acid into the acetonitrile layer;
separating the acetonitrile layer comprising the 4-chloro-2-fluoro-3-methoxyphenyl-boronic acid from the water layer;
utilizing the 4-chloro-2-fluoro-3-methoxyphenyl-boronic acid in the acetonitrile for a Suzuki coupling reaction without concentration or isolation acts.
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Abstract
Provided herein are methods of isolating a 4-chloro-2-fluoro-3-substituted-phenylboronic acid. The method comprises contacting a mixture of water, a water-miscible organic solvent, and a 4-chloro-2-fluoro-3-substituted-phenylboronic acid with a salt to form a water-miscible organic solvent layer and a water layer. The 4-chloro-2-fluoro-3-substituted-phenylboronic acid is partitioned into the water-miscible organic solvent layer, which is separated from the water layer. Additional methods are disclosed, as is a 4-chloro-2-fluoro-3-substituted-phenylboronic acid produced by one of the methods, wherein the 4-chloro-2-fluoro-3-substituted-phenylboronic acid is obtained at a yield of greater than approximately 90%.
10 Citations
17 Claims
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1. A method of isolating a 4-chloro-2-fluoro-3-methoxyphenyl-boronic acid, comprising:
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saturating a mixture of water, acetonitrile, and a 4-chloro-2-fluoro-3-methoxyphenyl-boronic acid with a salt to form an acetonitrile layer and a water layer; partitioning the 4-chloro-2-fluoro-3-methoxyphenyl-boronic acid into the acetonitrile layer; separating the acetonitrile layer comprising the 4-chloro-2-fluoro-3-methoxyphenyl-boronic acid from the water layer; utilizing the 4-chloro-2-fluoro-3-methoxyphenyl-boronic acid in the acetonitrile for a Suzuki coupling reaction without concentration or isolation acts. - View Dependent Claims (14, 15)
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2. A method of isolating a 4-chloro-2-fluoro-3-substituted-phenylboronic acid, comprising:
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adding a salt to an acetonitrile/water mixture comprising a 4-chloro-2-fluoro-3-substituted-phenylboronic acid to saturate the acetonitrile/water mixture; partitioning the 4-chloro-2-fluoro-3-substituted-phenylboronic acid into an acetonitrile layer; separating the acetonitrile layer comprising the 4-chloro-2-fluoro-3-substituted-phenylboronic acid from a water layer; and utilizing the 4-chloro-2-fluoro-3-substituted-phenylboronic acid in the acetonitrile for a synthesis of a herbicidal compound without concentration or isolation acts. - View Dependent Claims (3, 4, 5, 6, 7, 16, 17)
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8. A method of synthesizing and isolating 4-chloro-2-fluoro-3-methoxyphenylboronic acid, comprising:
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contacting 2-chloro-6-fluoroanisole (2,6-CFA) with n-butyl lithium to form a lithiated derivative of 2,6-CFA; contacting the lithiated derivative of 2,6-CFA with B(OCH3)3 to form a boronic acid ester of 2,6-CFA; contacting the boronic acid ester of 2,6-CFA with aqueous sodium hydroxide to form a sodium salt of the boronic acid of 2,6-CFA; contacting the sodium salt of the boronic acid of 2,6-CFA with aqueous hydrochloric acid to form a solution of 4-chloro-2-fluoro-3-methoxyphenylboronic acid; adding acetonitrile to the solution of 4-chloro-2-fluoro-3-methoxyphenylboronic acid to form a mixture of acetonitrile, water, and 4-chloro-2-fluoro-3-methoxyphenylboronic acid; adding a salt to the mixture of acetonitrile, water, and 4-chloro-2-fluoro-3-methoxyphenylboronic acid to saturate the mixture and form an acetonitrile layer and a water layer, the 4-chloro-2-fluoro-3-methoxyphenylboronic acid partitioning to the acetonitrile layer; separating the acetonitrile layer and the water layer; and using the 4-chloro-2-fluoro-3-methoxyphenylboronic acid in the acetonitrile for a synthesis of a herbicidal compound without concentration or isolation acts. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification