← Back to patent-cliff list
CAS 431-03-8
2,3-Butanedione
Codes：(II)409139-12-a
Application context (from source-drug indications)
转甲状腺素运载蛋白淀粉样变性氯苯唑酸心脏病氯苯唑酸
Source drugs (routes using this intermediate)
| Drug | Tier | Expiry |
|---|---|---|
| 氯苯唑酸Tafamidis | Tier C — Watch / trade | - |
Position in synthesis routes (up/downstream chain)
Ordered by route registration; left → right is the synthesis direction. The highlighted node is the current CAS; others link to their own profiles.
3,5-Dichloroaniline→2,3-Butanedione→1-(3,5-Dichlorophenyl)ethanone→(3,5-Dichlorophenyl)(oxo)acetic acid→2-Amino-5-methylphenol→2-(3,5-Dichlorophenyl)-6-methyl-1,3-benzoxazole→2-(3,5-Dichlorophenyl)benzo[d]oxazole-6-carboxylic acid
Intermediates available on this site
No listed intermediates for this target yet — send an RFQ directly and it will enter our matching pool.
This is a CAS-level registry record: registrations across routes are merged. Supplier offers and buyer demands will be matched on this CAS as the primary key.