Shanghai · APIs, intermediates and custom synthesis
Building blocks and intermediates your chemistry route actually needs
WesynTech supplies catalogue compounds and custom-synthesised material to pharmaceutical and biotech R&D teams — from the first gram on a medicinal chemistry bench to hundred-kilogram campaigns in the pilot plant.
The problem we solve
A programme moves at the speed of the compound it is waiting for
Discovery and process teams rarely stall on ideas. They stall on one structure that no catalogue lists, one intermediate that a supplier cannot repeat, one metal residue that will not come out. WesynTech exists at those three points.
- Not on a catalogue? It goes to the laboratory, not back to you — gram scale is a normal starting quantity.
- Needed again next quarter? The route that made the first batch is the route that makes the tenth.
- Awkward chemistry? Chiral centres, fluorine, boronic acids and esters, and heterocycles are where this team is deepest.
Product groups
Three ways compounds are listed here
The old catalogue split its compounds into actives, intermediates and everything else. That split is kept, because it maps to how buyers ask.
Active Pharmaceutical Ingredients
Named research APIs and clinical-stage actives supplied for reference, analytical and development work.
15 featured compounds →
02Pharmaceutical Intermediates
Key intermediates and starting materials carried forward into API routes.
7 featured compounds →
03Catalogue Building Blocks
Privileged building blocks held in the general catalogue, including compounds announced as kilogram stock.
5 featured compounds →
Featured compounds
Compounds with a page of their own
27 compounds are documented individually with structure, CAS number and supply notes. The other 645 in the catalogue are searchable in one table.
Services
From a structure on paper to a repeatable supply
Three services, one team. Nothing is handed across an internal boundary, which is why the reasoning behind a route survives the jump to larger equipment.
Early-stage R&D
Custom Synthesis
Gram-to-kilogram synthesis of compounds that are not on anyone's catalogue.
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Route optimisation
Process R&D
Turning a route that works once into a route that works every time.
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Scale-up supply
API & Intermediate Production
Repeat supply of starting materials and key intermediates for scale-up programmes.
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Who we supply
Three kinds of team, three different pressures
Drug Discovery Chemistry
Medicinal chemistry teams lose weeks to compounds nobody sells. WesynTech's catalogue and custom synthesis exist to shorten that wait.
What we supply →
Preclinical & Process Development
The jump from milligrams to the first kilo is where routes break. Pilot equipment and the chemists who wrote the route sit in the same building here.
What we supply →
CRO & CDMO Supply Partners
Service organisations are judged on what their own suppliers do. WesynTech works as the upstream chemistry partner behind those programmes.
What we supply →
The catalogue
672 compounds, one file, no enquiry required
Every compound WesynTech lists is published here with its CAS number and systematic name — searchable on the site and downloadable as a single spreadsheet. Sourcing decisions should not depend on getting someone to answer an e-mail first.
Technical notes
Written by the people running the reactors
Process note
Removing trace metal residues with dithiocarbamate scavengers
Organometallic reagents and homogeneous catalysts leave metal behind. A water-treatment reagent class turns out to strip copper from an organic stream down to single-digit ppm.
6 April 2022
Stock announcement
7-(Difluoromethyl)-1,2,3,4-tetrahydroquinoline available from kilogram stock
A fluorinated tetrahydroquinoline intermediate held in kilogram quantities, offered to new and existing customers.
13 March 2022
Send us the structure
A CAS number or a drawing and the quantity you need is enough to get a quotation moving. One team answers, from first sample to repeat campaign.