Upadacitinib N1-Tosyl Impurity (CAS 2411540-30-0) ist eine definierte prozessbedingte Verunreinigung, die durch N-Sulfonylierung am Pyrrolidin-Stickstoff des JAK1-Inhibitor-Gerüsts entsteht. Mit der Summenformel C24H25F3N6O3S und einer Molmasse von 534.55 g/mol handelt es sich um ein strukturell spezifisches Synthese-Nebenprodukt und nicht um einen bloßen Abbauartikel. Die aromatische Tosylgruppe verändert Polarität und Ionisationsverhalten, sodass die Identifizierung typischerweise LC-MS/MS mit hochauflösender MS-Bestätigung sowie HPLC-UV und gegebenenfalls NMR erfordert. Die Kontrolle ist im Rahmen von ICH Q3A/Q3B relevant und kann bei Mitführung in der Synthese eine Bewertung im Kontext genotoxischer Verunreinigungen erfordern.
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