Introduction: The Core of Leflunomide SynthesisIn the pharmaceutical manufacturing landscape of 2026, 5-Methyl-4-isoxazolecarboxylic acid (CAS No. 42831-50-5) remains a high-value building block. It is primarily recognized as Leflunomide Impurity D, though its primary industrial role is far more cri
Introduction: The High-Fluorine Building Block for 2026In the advanced agricultural sector of 2026, 2-Methyl-4-heptafluoroisopropylaniline (CAS No. 238098-26-5) has emerged as a cornerstone intermediate for the next generation of high-potency insecticides and herbicides. This compound, often referre
Introduction: The Strategic Intermediate for ImatinibIn the high-stakes pharmaceutical landscape of 2026, 4-(4-Methylpiperazinylmethyl)benzoyl chloride dihydrochloride (CAS No. 106261-64-7) stands as a "critical-path" intermediate. Known in industrial chemistry as Imatinib Intermediate 5, it is the