⚗️ Sinolook Chemical · Electronic Chemicals

1,2-Diaminocyclohexane in Pharma: Oxaliplatin & DACH-Platinum Precursors

💊 The chiral carrier ligand behind a major chemotherapy agent

Perhaps the highest-value role of 1,2-diaminocyclohexane (DACH) is in pharmaceuticals: it is the chiral carrier ligand at the core of oxaliplatin, a platinum-based chemotherapy drug. In this application, the molecule's stereochemistry isn't a detail - it is the whole point. This guide explains the DACH-platinum chemistry and the exacting demands it places on the precursor. 💊

The isomer story behind this starts in Cis vs Trans DACH and the path to a single enantiomer in resolving trans-DACH.

📌 Note: This article describes the chemistry of DACH as a pharmaceutical building block for industry and educational context. It is not medical advice and does not describe drug manufacturing procedures. Pharmaceutical production must follow GMP and all applicable regulations.

⚛️ The DACH-Platinum Moiety

Oxaliplatin belongs to the platinum(II) anticancer family alongside cisplatin and carboplatin. What distinguishes oxaliplatin is its carrier ligand: instead of two simple ammine groups, it uses a single trans-1,2-diaminocyclohexane chelating both coordination sites on the platinum. An oxalate group serves as the leaving group. 🔬

🔹 Carrier ligand: trans-(1R,2R)-1,2-diaminocyclohexane (the "DACH" in DACH-platinum)

🔹 Leaving group: oxalate

🎯 Why the (1R,2R) Configuration Is Required

In a chiral drug, different stereoisomers can behave like entirely different molecules biologically. Oxaliplatin specifically uses the (1R,2R)-trans enantiomer of DACH. That means the precursor cannot be the mixed isomer or the racemate - it must be the resolved, single (R,R) enantiomer at high enantiopurity. Any cis content or wrong-handed enantiomer is an impurity that must be controlled. This is exactly why the resolution chemistry covered earlier in this series matters so much. 💡

🧪 The Dichloro-1,2-Diaminocyclohexane Platinum(II) Intermediate

A key intermediate in DACH-platinum chemistry is dichloro(1,2-diaminocyclohexane)platinum(II) - often written as DACH-PtCl₂. Here the resolved diamine is already chelated to platinum, with two chloride ligands occupying the remaining sites. Conceptually, the route runs: 🔬

⚗️ (1R,2R)-DACH → DACH-platinum(II) dichloride intermediate → ligand exchange (oxalate) → the DACH-platinum oxalate active pharmaceutical structure

Reference information on oxaliplatin's structure is available on resources such as PubChem.

🎚️ What Pharma Demands From the DACH Precursor

✅ Correct enantiomer: the (1R,2R)-trans configuration, not mixed or racemic.

✅ High enantiopurity: tight control of enantiomeric excess and cis content.

✅ Low impurities: controlled related substances, metals, and residual solvents.

✅ Documentation: robust COA and full traceability for regulated supply chains.

💡 Pharmaceutical-intermediate use is governed by GMP and regulatory requirements; specifications must be agreed with the manufacturer and qualified for the specific drug application.

💊 Source DACH for Pharmaceutical Intermediates

Sinolook Chemical supplies 1,2-diaminocyclohexane with COA confirming isomer profile and purity. Discuss your pharma-intermediate specification and configuration requirements with our team.

👉 View DACH Product & Specifications

❓ Frequently Asked Questions

🔹 What is the role of 1,2-diaminocyclohexane in oxaliplatin?

DACH is the chiral carrier ligand chelated to the platinum(II) center in oxaliplatin, with an oxalate leaving group. The specific enantiomer used is trans-(1R,2R)-DACH.

🔹 Why must the (1R,2R) enantiomer be used?

Stereochemistry determines biological behavior in chiral drugs. Oxaliplatin requires the resolved (1R,2R)-trans enantiomer at high enantiopurity; mixed or racemic material is not suitable.

🔹 What is dichloro(1,2-diaminocyclohexane)platinum(II)?

It is a DACH-platinum intermediate (DACH-PtCl₂) in which the resolved diamine is chelated to platinum with two chloride ligands, used en route to DACH-platinum drug structures.

🔹 What quality is needed for pharmaceutical DACH?

The correct (1R,2R) enantiomer at high enantiopurity, tightly controlled impurities, and full documentation, all consistent with GMP and the relevant regulatory requirements.