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Valenti G, Tinnemans P, Baglai I, Noorduin WL, Kaptein B, Leeman M, Ter Horst JH, Kellogg RM. Combining Incompatible Processes for Deracemization of a Praziquantel Derivative under Flow Conditions. Angew Chem Int Ed Engl 2021; 60:5279-5282. [PMID: 33241861 DOI: 10.1002/anie.202013502] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Indexed: 01/03/2023]
Abstract
An efficient deracemization method for conversion of the racemate to the desirable (R)-enantiomer of Praziquantel has been developed by coupling incompatible racemization and crystallization processes. By a library approach, a derivative that crystallizes as a conglomerate has been identified. Racemization occurs via reversible hydrogenation over a palladium on carbon (Pd/C) packed column at 130 °C, whereas deracemization is achieved by alternating crystal growth/dissolution steps with temperature cycling between 5-15 °C. These incompatible processes are combined by means of a flow system resulting in complete deracemization of the solid phase to the desired (R)-enantiomer (98 % ee). Such an unprecedented deracemization by a decoupled crystallization/racemization approach can readily be turned into a practical process and opens new opportunities for the development of essential enantiomerically pure building blocks that require harsh methods for racemization.
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Affiliation(s)
| | - Paul Tinnemans
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525, AJ, Nijmegen, The Netherlands
| | - Iaroslav Baglai
- AMOLF, Science Park 104, 1098 XG, Amsterdam, The Netherlands
| | - Willem L Noorduin
- AMOLF, Science Park 104, 1098 XG, Amsterdam, The Netherlands.,Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1090 GD, Amsterdam, The Netherlands
| | - Bernard Kaptein
- InnoSyn BV, Urmonderbaan 22, 6167 RD, Geleen, The Netherlands
| | - Michel Leeman
- Symeres, Kadijk 3, 9747 AT, Groningen, The Netherlands
| | - Joop H Ter Horst
- EPSRC Centre for Innovative Manufacturing in Continuous Manufacturing and Crystallisation (CMAC), Strathclyde Institute of Pharmacy and Biomedical Sciences, Technology and Innovation Centre, University of Strathclyde, 99 George Street, Glasgow, G1 1RD, UK
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Valenti G, Tinnemans P, Baglai I, Noorduin WL, Kaptein B, Leeman M, ter Horst JH, Kellogg RM. Combining Incompatible Processes for Deracemization of a Praziquantel Derivative under Flow Conditions. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202013502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
| | - Paul Tinnemans
- Institute for Molecules and Materials Radboud University Heyendaalseweg 135 6525 AJ Nijmegen The Netherlands
| | | | - Willem L. Noorduin
- AMOLF Science Park 104 1098 XG Amsterdam The Netherlands
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam Science Park 904 1090 GD Amsterdam The Netherlands
| | | | | | - Joop H. ter Horst
- EPSRC Centre for Innovative Manufacturing in Continuous Manufacturing and Crystallisation (CMAC) Strathclyde Institute of Pharmacy and Biomedical Sciences, Technology and Innovation Centre University of Strathclyde 99 George Street Glasgow G1 1RD UK
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Savela R, Shcherban ND, Melander MM, Bezverkhyy I, Simakova IL, Långvik O, Kholkina E, Schindler T, Krauβ A, Honkala K, Murzin DY, Leino R. Chemoselective heterogeneous iridium catalyzed hydrogenation of cinnamalaniline. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01886d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A selective atmospheric hydrogenation of unsaturated imines over heterogeneous iridium catalyst is described, in addition the selectivity is elucidated by DFT-calculations.
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