Use of Immobilized Amine Transaminase from Vibrio fluvialis under Flow Conditions for the Synthesis of (S)‐1‐(5‐Fluoropyrimidin‐2‐yl)‐ethanamine

• Riccardo Semproli ^[a]
• Gianmarco Vaccaro ^[a],[b]
• Erica E. Ferrandi ^[c]
• Marta Vanoni ^[c]
• Teodora Bavaro ^[a]
• Giorgio Marrubini ^[a]
• Francesca Annunziata ^[b]
• Paola Conti ^[b]
• Giovanna Speranza ^[d]
• Daniela Monti ^[*c]
• Lucia Tamborini ^[*b]
• Daniela Ubiali ^[*a]

• ^[a] R. Semproli, G. Vaccaro, Dr. G. Marrubini, Dr. T. Bavaro, Prof. D. Ubiali, Department of Drug Sciences, University of Pavia, Viale Taramelli 12, I-27100 Pavia, Italy
• ^[b] G. Vaccaro, F. Annunziata, Prof. P. Conti, Prof. L. Tamborini, Department of Pharmaceutical Sciences, University of Milano, Via Mangiagalli 25, I-20133 Milano, Italy
• ^[c] Dr. E. E. Ferrandi, M. Vanoni, Dr. D. Monti, Istituto di Scienze e Tecnologie Chimiche "Giulio Natta" (SCITEC) – CNR, Via Bianco 9, I-20131 Milano, Italy
• ^[d] Prof. G. Speranza, Department of Chemistry, University of Milano, Via Golgi 19, I-20133 Milano, Italy

We report on the covalent immobilization of the (S)‐selective amine transaminase from Vibrio fluvialis (Vf‐ATA) and its use in the synthesis of (S)‐1‐(5‐fluoropyrimidin‐2‐yl)‐ethanamine, a key intermediate of the JAK2 kinase inhibitor AZD1480. Immobilized Vf‐ATA on glyoxyl‐agarose (activity recovery: 30%) was used in a packed bed reactor to set‐up a continuous flow biotransformation coupled with a straightforward in‐line purification to circumvent the 2‐step process described in literature for the batch reaction. The newly developed biotransformation was run in a homogeneous system including dimethyl carbonate as a green co‐solvent. Optically pure (S)‐1‐(5‐fluoropyrimidin‐2‐yl)‐ethanamine (ee >99%) was isolated in 35% yield.

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