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Chen MW, Li HW, Wang YQ, Wu B, Liu Z, Lai X, Deerberg J, Zhou YG. Iridium-Catalyzed Asymmetric Hydrogenation of Heteroaromatics with Multiple N Atoms via Substrate Activation: An Entry to 4,5,6,7-Tetrahydropyrazolo[1,5- a]pyrimidine-3-carbonitrile Core of a Potent BTK Inhibitor. J Org Chem 2024; 89:4336-4348. [PMID: 38465834 DOI: 10.1021/acs.joc.3c02396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
The chiral 4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine is the key core skeleton of potent Bruton's tyrosine kinase (BTK) inhibitor Zanubrutinib, and the catalyst-controlled asymmetric hydrogenation of planar multinuclear pyrimidine heteroarenes with multiple N atoms could provide an efficient route toward its synthesis. Owing to the strong aromaticity and poisoning effect toward chiral transition metal catalyst, asymmetric hydrogenation of pyrazolo[1,5-a]pyrimidines with multiple nitrogen atoms is still a challenge for synthesizing the chiral 4,5,6,7-tetrahydropyrazolo[1,5-a]-pyrimidine. Herein, an efficient iridium-catalyzed asymmetric hydrogenation of pyrazolo[1,5-a]pyrimidines has been developed using substrate activation strategy, with up to 99% ee. The decagram scale synthesis further demonstrated the potential and promise of this procedure in the synthesis of Zanubrutinib. In addition, a mechanistic study indicated that the hydrogenation starts with 1,2-hydrogenation.
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Affiliation(s)
- Mu-Wang Chen
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, P. R. China
| | - Hong-Wang Li
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, P. R. China
| | - Ying-Qi Wang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, P. R. China
| | - Bo Wu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, P. R. China
| | - Zheng Liu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, P. R. China
| | - Xinzhong Lai
- Chemical Process Research and Development, Department of Chemistry, BeiGene, Ltd., No. 30 Science Park Rd, Zhong-Guan-Cun Life Science Park, Changping District, Beijing 102206, P. R. China
| | - Joerg Deerberg
- Chemical Process Research and Development, Department of Chemistry, BeiGene, Ltd., No. 30 Science Park Rd, Zhong-Guan-Cun Life Science Park, Changping District, Beijing 102206, P. R. China
| | - Yong-Gui Zhou
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, P. R. China
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Yuan H, Yao W, Zhang X, Wei Z, Xi J, Hao Y, Liu X, Jiang R, Nie H. Highly Enantioselective Ir-Catalyzed Hydrogenation of Pyrazolo[1,5- a]pyrimidine for the Synthesis of Zanubrutinib. J Org Chem 2024; 89:1748-1752. [PMID: 38262733 DOI: 10.1021/acs.joc.3c02446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
A highly enantioselective catalytic reduction of pyrazolo[1,5-a]pyrimidine to zanubrutinib has been realized by the Ir/(R)-t-Bu-FcPhox complex. This chiral product could be obtained in up to >99% ee in the asymmetric transformation without any other additives, providing a new route for the asymmetric synthesis of zanubrutinib.
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Affiliation(s)
- Haohuan Yuan
- Department of Medicinal Chemistry, School of Pharmacy, Fourth Military Medical University, Xi'an 710032, China
| | - Wei Yao
- Department of Medicinal Chemistry, School of Pharmacy, Fourth Military Medical University, Xi'an 710032, China
| | - Xiaomin Zhang
- Department of Medicinal Chemistry, School of Pharmacy, Fourth Military Medical University, Xi'an 710032, China
| | - Zhao Wei
- Department of Medicinal Chemistry, School of Pharmacy, Fourth Military Medical University, Xi'an 710032, China
| | - Jiayue Xi
- Department of Medicinal Chemistry, School of Pharmacy, Fourth Military Medical University, Xi'an 710032, China
| | | | - Xian Liu
- Department of Pharmaceutical Sciences, Beijing Institute of Radiation Medicine, Beijing 100850, China
| | - Ru Jiang
- Department of Medicinal Chemistry, School of Pharmacy, Fourth Military Medical University, Xi'an 710032, China
| | - Huifang Nie
- Department of Medicinal Chemistry, School of Pharmacy, Fourth Military Medical University, Xi'an 710032, China
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