Multi-gram preparation of cinnamoyl tryptamines as skin whitening agents through a chemo-enzymatic flow process

• David Roura Padrosa^a
• Martina L. Contente^b

• ^aDepartment of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
• ^bDepartment of Food, Environmental and Nutritional Sciences (DeFENS), University of Milan, via Celoria 2, 20133, Milan, Italy

A 2-step flow-based chemo-enzymatic synthesis of selected cinnamoyl tryptamines as potential cosmetic ingredients has been developed. A first reaction catalyzed by immobilized Pd(OAc)2 gave the acyl donors employed as starting material in the second step, with very good yields (67–70%) and rapid reaction times (30 min). A second bioreactor made of imm-MsAcT, a glyoxyl-agarose immobilized acyl transferase from Mycobacterium smegmatis, was employed for the fast and efficient preparation of the desired amides (58–70% m.c., 15 min). In-line work-up allowing for the recovery and reuse of the unreacted substrates was added downstream the process, enhancing its automation. The combination of flow facilities, high substrate-to-catalyst ratio and closed-loop strategies make this methodology a sustainable and cost-effective procedure. Computational studies were carried out to provide insights into the enzymatic active site and substrate recognition.

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