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2
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Qu B, Lee J, Wu L, Saha AK, Li G, Xu Y, Tan Z, Brazzillo J, Haddad N, Pennino S, Rodriguez S, Lorenz JC, Frutos R, Sidhu KPS, Wang XJ, Zhang Y, Senanayake CH, Song JJ. Scalable Process of Spiro(cyclopropane)oxazepane Pyridine Carboxylic Acid through Kulinkovich, Mitsunobu, and Pd-Catalyzed Intramolecular C–N Coupling. Org Process Res Dev 2022. [DOI: 10.1021/acs.oprd.2c00221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bo Qu
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Jaehee Lee
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Lifen Wu
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Anjan K. Saha
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Guisheng Li
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Yibo Xu
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Zhulin Tan
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Jason Brazzillo
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Nizar Haddad
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Scott Pennino
- Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Sonia Rodriguez
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Jon C. Lorenz
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Rogelio Frutos
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Kanwar P. S. Sidhu
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Xiao-Jun Wang
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Yongda Zhang
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Chris H. Senanayake
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
| | - Jinhua J. Song
- Chemical Development US, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Connecticut 06877, United States
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5
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Bhattacharya P, Senapati K, Chattopadhyay K, Mandal SM, Basak A. Synthesis of benzochromenes and dihydrophenanthridines with helical motifs using Garratt–Braverman and Buchwald–Hartwig reactions. RSC Adv 2015. [DOI: 10.1039/c5ra12512j] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
X-ray structures of dihydrophenanthiridine (a) and benzochromene (b) showing greater helicity in (a).
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Affiliation(s)
| | - Kalyan Senapati
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| | | | - Santi M. Mandal
- Central Research Facility
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - Amit Basak
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
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8
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Cho H, Iwama Y, Okano K, Tokuyama H. Synthesis of a Human Urate Transporter-1 Inhibitor, an Arginine Vasopressin Antagonist, and a 17β-Hydroxysteroid Dehydrogenase Type-3 Inhibitor, Using Ring-Expansion of Cyclic Ketoximes with DIBALH. Chem Pharm Bull (Tokyo) 2014; 62:354-63. [DOI: 10.1248/cpb.c13-00961] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Hidetsura Cho
- Graduate School of Pharmaceutical Sciences, Tohoku University
- Graduate School of Science, Tohoku University
| | - Yusuke Iwama
- Graduate School of Pharmaceutical Sciences, Tohoku University
| | - Kentaro Okano
- Graduate School of Pharmaceutical Sciences, Tohoku University
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11
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Cho H, Iwama Y, Mitsuhashi N, Sugimoto K, Okano K, Tokuyama H. Ring-expansion reaction of oximes with aluminum reductants. Molecules 2012; 17:7348-55. [PMID: 22699568 PMCID: PMC6268446 DOI: 10.3390/molecules17067348] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Revised: 06/04/2012] [Accepted: 06/07/2012] [Indexed: 11/16/2022] Open
Abstract
The ring-expansion reactions of heterocyclic ketoximes and carbocyclic ketoximes with several reductants such as AlHCl2, AlH3 (alane), LiAlH4, LiAlH(OtBu)3, and (MeOCH2CH2O)2AlH2Na (Red-Al) were examined. Among reductants, AlHCl2 (LiAlH4:AlCl3 = 1:3) in cyclopentyl methyl ether (CPME) has been found to be a suitable reagent for the reaction, and the rearranged cyclic secondary amines were obtained in good to excellent yields.
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Affiliation(s)
- Hidetsura Cho
- Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
- Authors to whom correspondence should be addressed; (H.C.); (H.T.); Tel.: +81-22-795-6887 (H.T.); Fax: +81-22-795-6887 (H.T.)
| | - Yusuke Iwama
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Nakako Mitsuhashi
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Kenji Sugimoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Kentaro Okano
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Hidetoshi Tokuyama
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
- Authors to whom correspondence should be addressed; (H.C.); (H.T.); Tel.: +81-22-795-6887 (H.T.); Fax: +81-22-795-6887 (H.T.)
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12
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Iwama Y, Okano K, Sugimoto K, Tokuyama H. Concise Total Synthesis of (−)-Mersicarpine. Org Lett 2012; 14:2320-2. [DOI: 10.1021/ol300735g] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yusuke Iwama
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Kentaro Okano
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Kenji Sugimoto
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Hidetoshi Tokuyama
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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