Document Code: SCF-SYN-CRO-N6K7-EPI-GMS-0001

Classification: GMP-Translatable Synthetic Route Development Package

I. SYNTHESIS STRATEGY OVERVIEW

Core Synthetic Logic

All top analogs share a modular convergent synthesis strategy:

1. R1 Aromatic Fragment Synthesis
2. Heterocycle Core (R2) Construction
3. Linker Coupling (Amide Formation)
4. Late-Stage Functionalization (R3/R4 tuning)

General Reaction Flow

$Aromatic\ Acid + Amine\ Linker + Heterocycle \rightarrow Final\ API$

II. COMMON INTERMEDIATE BUILDING BLOCKS

2.1 Intermediate A — Aromatic Acid Core

General Structure:

Substituted benzoic acid derivatives

Synthesis

• Starting material: substituted anisole or fluorobenzene
• Oxidation → benzoic acid

Reagents:

• KMnO₄ or Jones oxidation

2.2 Intermediate B — Diamine Linker

Structure:

H₂N–CH₂–CH₂–NH₂

Source

• Commercially available (ethylenediamine)

2.3 Intermediate C — Heterocycle Core (Purine/Analog)

Route

• Cyclization of:
• Diaminopyrimidine precursors
• Formamide derivatives

III. COMPOUND-SPECIFIC SYNTHESIS ROUTES

1. NQ-1 (PRIMARY LEAD)

SMILES:

COC1=CC=CC=C1C(=O)NCC2=NC=NC3=C2N(C)C=N3F

Stepwise Route

Step 1 — Aromatic Acid Formation

• Starting: anisole
• Friedel–Crafts acylation → acetophenone
• Oxidation → 4-methoxybenzoic acid

Step 2 — Amide Coupling

• React acid with ethylenediamine

Conditions:

• EDCI / HOBt
• DMF, 0–25°C

→ Intermediate amide

Step 3 — Heterocycle Coupling

• Nucleophilic substitution with fluorinated purine

Conditions:

• Base: K₂CO₃
• Solvent: DMSO
• Temp: 80–100°C

Step 4 — Final Purification

• Column chromatography
• Recrystallization (EtOH/water)

2. NQ-3 (BBB-OPTIMIZED)

Modification: Fluorophenyl substitution

Key Differences

• Start with fluorobenzene derivative
• Same coupling strategy

Critical Step

• Control regioselectivity in fluorination

Reagents:

• Selectfluor (if late-stage fluorination)

3. NQ-8 (Kv7-ENHANCED)

Feature: Phenolic –OH

Synthetic Adjustments

Step 1

• Use protected phenol:
• Methoxy group → demethylation later

Step 2 — Deprotection

• BBr₃ (boron tribromide)

Conditions:

• −78°C → RT

Outcome

• Free phenolic group → Kv7 activation enhancement

4. NQ-11 (DERM / QUANTUM-OPTIMIZED)

Feature: Imine (C=N) linker

Synthetic Route

Step 1

• Aldehyde-functionalized aromatic

Step 2 — Schiff Base Formation

• React with amine linker

R-CHO + R'-NH₂ \rightarrow R-CH=N-R'

Conditions

• Solvent: ethanol
• Catalyst: trace acid
• Mild ताप

Critical Control

• Maintain imine stability
• Optional reduction → secondary amine (if needed)

5. NQ-14 (PK-OPTIMIZED)

Feature: Fluorinated aromatic system

Route

• Similar to NQ-1
• Use para-fluorobenzoic acid

Key Optimization

• Avoid over-fluorination
• Control lipophilicity

IV. SCALABLE SYNTHESIS PARAMETERS (CRO-READY)

4.1 Reaction Conditions

4.2 Yield Targets

4.3 Scale-Up Considerations

• Replace DMF with greener solvents if needed
• Use continuous flow for:
• Oxidation steps
• Coupling reactions

V. ANALYTICAL & QC REQUIREMENTS

5.1 Characterization

5.2 Impurity Control

• Residual solvents (ICH Q3C)
• Unreacted amines/acids
• Byproducts from oxidation

VI. GMP TRANSITION STRATEGY

6.1 Process Optimization

• Reduce steps to ≤4 where possible
• Optimize:
• Yield
• Reproducibility

6.2 Safety Considerations

VII. SCF SYNTHESIS OPTIMIZATION LOGIC

Key SCF Enhancements

• Preserve electronic structure (HOMO/LUMO)
• Maintain DERM capability
• Optimize lipophilicity for BBB
• Ensure functional group integrity for dual activity

VIII. CRO EXECUTION PACKAGE

Deliverables to CRO

1. Synthetic scheme (this document)
2. Starting materials list
3. Reaction conditions + optimization windows
4. Analytical validation protocols
5. Scale-up guidelines

IX. INTEGRATED SCF LOGIC SUMMARY

Modular synthesis → structural precision → electronic optimization → scalable production → clinical translation readiness

MASTER REGISTRY INDEX

• SCF-SYN-CRO-N6K7-EPI-GMS-0001 — CRO Synthesis Routes
• SCF-MCC-N6K7-EPI-GMS-0001 — Medicinal Chemistry Campaign
• SCF-TLC-DPK-N6K7-EPI-GMS-0001 — Lead Candidate Docking
• SCF-ADP-N6K7-EPI-GMS-0001 — API Discovery Profile
• SCF-QGLE-EPI-GMS-0001 — Quantum Ligand Engineering
• SCF-SEF-MD-0001 — Synergistic Evaluation Framework

If you want next, I can generate:

• Step-by-step reaction schemes (with reagents drawn visually)
• Cost of goods (COGs) + scalability analysis
• GMP batch record templates
• Patent-ready synthetic claims (routes + intermediates)