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(3S,5R)-Posaconazole tetrahydrofuran tosylate intermediate | CAS 149809-43-8

A (3S,5R)-defined tetrahydrofuran fragment combining a difluorophenyl group, triazolylmethyl substituent and covalent tosylate leaving group, documented as the ring-side coupling partner in a protected posaconazole route.

CAS149809-43-8
Molecular formulaC21H21F2N3O4S
Molecular weight449.5 g/mol

Product overview

This (3S,5R) tetrahydrofuran carries a 2,4-difluorophenyl group, triazolylmethyl substituent and an activated hydroxymethyl tosylate. The covalent tosylate provides the connection to a phenolic partner in posaconazole assembly. Qualification should establish stereochemistry, triazole attachment and the analytical distinction between the ester and its corresponding alcohol.

Chemical identity

Chemical name
(3S,5R)-Posaconazole tetrahydrofuran tosylate intermediate
CAS number
149809-43-8
Molecular formula
C21H21F2N3O4S
Molecular weight
449.5 g/mol

Application context

In a reported posaconazole route, this tosylate is the electrophilic tetrahydrofuran partner for coupling with a phenolic, benzyl-protected side-chain fragment. The connection forms an ether linking the two molecular portions. Confirm the (3S,5R) substrate, triazole attachment and intact tosylate, and distinguish the corresponding alcohol in the related-substance method.

Chemistry and synthetic role

The tetrahydrofuran framework has the (3S,5R) configuration and two different substituents at C5. Its hydroxymethyl group is activated as a covalent p-toluenesulfonate ester. Coupling with the phenolic partner forms the ether linking the two posaconazole fragments.

Quality review

Verify the specified isomer

Agree identification and isomer-selective testing for the (3S,5R) material; an achiral area-purity result cannot establish the whole stereochemical profile.

Confirm intact covalent tosylate

Differentiate the ester from its corresponding alcohol and relevant free sulfonic-acid components.

Check triazole attachment and aryl positions

Confirm the triazole nitrogen linkage and the 2,4-difluorophenyl substitution, using a complete reference structure.

Link water criteria to the next step

Set water and solvent requirements according to the qualified ether-forming process, not a generic intermediate specification.

Preparing a specification

Provide CAS, the complete (3S,5R) structure and the required isomer profile. Define assay and related-substance methods, including separation of the corresponding alcohol where relevant, and state process-supported water or residual-solvent criteria.

Packaging and storage

Agree packaging, net weight and transport arrangements for the selected grade, quantity and destination. Confirm storage and handling conditions using the current SDS for the proposed material.

Documentation

Request structure-confirming data, stereochemical evidence and the method used to distinguish tosylate from alcohol. Confirm availability of batch COA, SDS and chromatograms suitable for the proposed qualification.

Procurement questions

Is this a tosylate salt?

No. The p-toluenesulfonate is attached covalently as an ester of the hydroxymethyl group.

Is “posaconazole main ring” sufficiently precise?

No. Include CAS, the activated tosylate form and the (3S,5R) structure.

Does ordinary HPLC purity prove the configuration?

Only a method demonstrated to resolve the relevant stereoisomers can support the required isomer criteria.

Does a changed R/S descriptor prove inversion downstream?

Not on its own. Structural mapping and the applicable priority rules must be reviewed.

Technical sources
  1. PubChem CID 10895629: properties and CAS synonym crosscheckNCBI / PubChem
  2. (3S,5R)-5-(2,4-Difluorophenyl)-5-[(1H-1,2,4-triazol-1-yl)methyl]oxolan-3-ylmethyl p-Toluenesulfonate — D4537Tokyo Chemical Industry
  3. EP3353169B1 — Crystalline forms of posaconazole intermediate and process for the preparation of amorphous posaconazoleEuropean Patent Office / Biocon Limited