4-Step Convergent Synthesis of PN6047 HCl via Sequential Suzuki Coupling

PN6047 HCl is a promising analgesic compound whose existing synthesis route presents three interconnected barriers to commercial-scale manufacture: low yields, a cost-prohibitive coupling reagent, and an environmentally burdensome solvent pathway. CCG developed a convergent 4-step alternative route that eliminates all three simultaneously — replacing HATU-dependent amide chemistry with pre-amidated boronic acid coupling partners, substituting direct N-alkylation for reductive amination, and delivering a fully Class 3 solvent pathway throughout. The route is built entirely from commodity starting materials with confirmed multi-supplier tonne-scale availability and projected cost of goods competitive with the challenge target.