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HONGKUN / PRODUCT DIRECTORY

6,7-Difluoro-8-methoxyquinolone ethyl ester | CAS 112811-71-9

With the quinolone ring already assembled, this ethyl ester provides an N-cyclopropyl, 6,7-difluoro, 8-methoxy framework for fluoroquinolone chemistry; confirming the ester stage is essential when matching a route to a material enquiry.

CAS112811-71-9
Molecular formulaC16H15F2NO4

Product overview

An ethyl ester at the quinolone 3-carboxyl group identifies this stage of gatifloxacin intermediate chemistry. The preassembled ring also carries N1-cyclopropyl, fluorine at C6 and C7, methoxy at C8 and a 4-oxo function. This combination supplies the nucleus used in research on 8-methoxyfluoroquinolone derivatives. The ester group is an important purchasing distinction from the companion free acid, CAS 112811-72-0, because the receiving sequence determines which form is required. Specify the ethyl ester in the enquiry alongside the complete substitution pattern. Qualification should address ester content, any accompanying free acid and a common assay basis, including water or residual-solvent corrections where these enter the charging calculation.

Chemical identity

Chemical name
Ethyl 1-cyclopropyl-6,7-difluoro-8-methoxy-4-oxo-1,4-dihydroquinoline-3-carboxylate
CAS number
112811-71-9
Molecular formula
C16H15F2NO4

Application context

This assembled quinolone ester is used in research on 8-methoxyfluoroquinolone derivatives and occurs in gatifloxacin intermediate chemistry. It supplies the N-cyclopropyl, 6,7-difluoro, 8-methoxy nucleus for subsequent modification, including chemistry at C7. The ethyl ester stage is a key purchasing distinction from the free acid, CAS 112811-72-0. Specify ester content, relevant free-acid limits and structural evidence for the ring substituents against the intended downstream transformation.

Chemistry and synthetic role

The molecule combines an ester carbonyl and the quinolone 4-oxo group. The two ring fluorines and 8-methoxy substituent identify this particular nucleus; they should not be collapsed into the label “fluoroquinolone ester”.

Quality review

Distinguish ester from free acid

Require identification and, where relevant, chromatographic separation of CAS 112811-72-0 rather than treating both stages as one material.

Confirm the substituted nucleus

Use suitable structural evidence for 6,7-difluoro, 8-methoxy and N-cyclopropyl substitution.

Define the ester assay

State whether content is an absolute assay or area purity; agree water and residual-solvent corrections if used in the charge calculation.

Preparing a specification

Specify CAS 112811-71-9 as the ethyl ester, the required assay basis and a limit for the companion free acid if relevant. Include identity evidence for the substituted quinolone nucleus.

Packaging and storage

Confirm packaging format, net weight and transport arrangements for the selected grade, order quantity and destination. Request the applicable SDS and label to establish storage and handling conditions.

Documentation

Request the proposed specification, batch COA and current SDS. Confirm availability of the analytical methods and batch evidence relevant to the intended process. Confirm availability of spectra and chromatograms resolving the ester from the corresponding acid.

Procurement questions

Is this the material called gatifloxacin Q-acid?

No. This CAS is the ethyl ester; the corresponding acid is CAS 112811-72-0.

Which ring substituents should identity testing confirm?

The required nucleus contains N1-cyclopropyl, 6,7-difluoro and 8-methoxy substitution, with a 4-oxo group and the C3 ethyl ester.

Which distinction matters most when comparing quotations?

Confirm that every offer refers to the same ester form and analytical assay basis.

Technical sources
  1. PubChem CID 10758239: identity properties and CAS synonymsNCBI / PubChem
  2. E1147: Ethyl 1-cyclopropyl-6,7-difluoro-8-methoxy-4-oxoquinoline-3-carboxylateTokyo Chemical Industry
  3. Product catalogue: Gatifloxacin EthylesterDadi Pharmaceutical