# US 10,246,445 B2 · Method for producing benzoxazole compound

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- Number: US 10,246,445 B2
- Document ID: US10246445B2
- Status: Granted
- Kind: B2
- Application number: 16/076,353
- Filed: 2016-12-06
- Published: 2019-02-07
- Granted: 2019-04-02
- Earliest claimed: 2016-02-12
- Assignees: Sumitomo Chemical Company, Limited
- Applicants: Sumitomo Chemical Company, Limited
- Inventors: Koji Hagiya
- Web page: https://patentgrep.com/patent/US10246445B2

## CPC

- C07D 413/04: directly linked by a ring-member-to-ring-member bond
- C07D 213/81: Amides; Imides
- C07B 61/00: Other general methods
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- C07B: GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR (preparation of carboxylic acid esters by telomerisation C07C67/47; telomerisation C08F)

## Abstract

A method is provided for producing a compound represented by formula (3), wherein n is 1, 2, 3 or 4, by mixing a compound represented by formula (2), a tri(C1-C3 alkyl)silyl(C1-C4 perfluoroalkane) and a fluoride. A method for producing the compound represented by formula (3) contains a step for producing the compound represented by formula (2) by an intramolecular dehydration condensation of a compound represented by formula (1) and by a step for mixing the compound represented by formula (2), a tri(C1-C3 alkyl)silyl(C1-C4 perfluoroalkane) and a fluoride.

## Claims

### Claim 1

A method for preparing a compound represented by formula (3):
wherein n is 1, 2, 3, or 4,
which comprises mixing a compound represented by formula (2)
tri(C1-C3 alkyl)silyl(C1-C4 perfluoroalkane), and a fluoride.

### Claim 2

A method for preparing a compound represented by formula (3):
wherein n is 1, 2, 3, or 4,
which comprises a step of preparing a compound represented by formula (2):
by an intramolecular dehydration condensation of a compound represented by formula (1):
and a step of mixing the compound represented by formula (2), tri(C1-C3 alkyl)silyl(C1-C4 perfluoroalkane), and a fluoride.

### Claim 3

A compound represented by formula (1):

### Claim 4

A compound represented by formula (2):