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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

ATS-8 — (4R,6R) cyanomethyl dioxane ester | CAS 125971-94-0

A stereodefined, doubly protected atorvastatin side-chain precursor with a nitrile handle, where two-centre configuration, acetal integrity and tert-butyl ester identity must be evaluated separately from chemical assay.

CAS125971-94-0
Molecular formulaC14H23NO4
Molecular weight269.34 g/mol

Product overview

ATS-8 combines a protected diol framework with two further functional elements: a tert-butyl ester at the acid end and a cyanomethyl group for conversion to an aminoethyl connection. The cyclic acetal fixes the protected framework around the 4R,6R stereocentres. Published atorvastatin routes carry this side chain into subsequent synthesis, making configuration and protection state central to selection. Specify CAS 125971-94-0 alongside the ATS-8 code and complete structure. Qualification should assess relevant enantiomers and diastereomers, confirm the nitrile stage and distinguish partially deprotected compounds. A chemical assay and appropriate stereoselective analysis provide the complementary results needed to define the usable protected side-chain material.

Chemical identity

Chemical name
tert-Butyl (4R,6R)-6-(cyanomethyl)-2,2-dimethyl-1,3-dioxane-4-acetate
CAS number
125971-94-0
Molecular formula
C14H23NO4
Molecular weight
269.34 g/mol

Application context

In published atorvastatin sequences, the cyanomethyl group of ATS-8 is converted to an aminoethyl group for subsequent assembly. The cyclic acetal protects the diol framework and the tert-butyl ester protects the acid end throughout this stage. Specify both 4R and 6R configurations, the nitrile stage and intact protecting groups. Qualification should combine chemical assay with the chiral or diastereomeric tests needed to resolve relevant stereoisomers and partially deprotected species.

Chemistry and synthetic role

The 1,3-dioxane is a cyclic acetal protecting the diol, not a protecting group on nitrogen. The nitrogen is present as a nitrile. A tert-butyl carboxylate remains at the other end of the side chain; these are distinct functions requiring correct assignment.

Quality review

Verify both stereocentres

Require evidence supporting 4R,6R and an agreed method for relevant stereoisomers. Chemical area purity and a single rotation reading do not automatically establish the full stereochemical profile.

Check protection-state integrity

Review methods for species with altered acetal or ester protection when relevant to the source and receiving process. These changes affect identity as well as usable content.

Confirm the nitrile stage

Distinguish ATS-8 from the aminoethyl derivative and other side-chain precursors using structural and chromatographic evidence. Supplier stage codes alone are insufficient.

Preparing a specification

Specify CAS 125971-94-0, 4R,6R configuration, nitrile identity and both protecting groups. Agree chemical assay, chiral/diastereomeric criteria, water and related-substances methods for the intended conversion.

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 stereochemical evidence, identity spectra and chemical and chiral chromatograms as appropriate. Confirm availability of the selected grade specification, batch COA, SDS and residual-solvent information.

Procurement questions

Does ATS-8 identify the material completely?

No. Include CAS, the cyanomethyl structure and 4R,6R configuration because stage abbreviations can vary.

Is ordinary HPLC purity enough?

Not necessarily; a nonchiral method may not resolve the opposite enantiomer.

Is the nitrile an amino protecting group?

No. It is a functional group converted to an aminoethyl connection in the cited route.

Technical sources
  1. tert-Butyl (4R,6R)-6-cyanomethyl-2,2-dimethyl-1,3-dioxane-4-acetate 539015Sigma-Aldrich
  2. PubChem CID 2734287NCBI PubChem
  3. Process for production of atorvastatin calciumUS20090216029A1 / Google Patents
  4. Advanced intermediates catalogueZhejiang Hisun Pharmaceutical