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Yu W, Wang P, Xu K, Li H. Iron‐Promoted Radical Cyclization of β, γ‐Unsaturated Oximes: Dual Role of Iron(III) Nitrate as a Promoter and Nitrooxy Source. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Wei Yu
- Key Laboratory of Green and Precise Synthetic Chemistry and Application Ministry of Education; School of Chemistry and Material Science, Huaibei Normal University Huaibei, Anhui 235000 P. R. China
| | - Pei‐Long Wang
- Key Laboratory of Green and Precise Synthetic Chemistry and Application Ministry of Education; School of Chemistry and Material Science, Huaibei Normal University Huaibei, Anhui 235000 P. R. China
- Information College Huaibei Normal University Huaibei 235000 P. R. China
| | - Ke Xu
- Key Laboratory of Green and Precise Synthetic Chemistry and Application Ministry of Education; School of Chemistry and Material Science, Huaibei Normal University Huaibei, Anhui 235000 P. R. China
| | - Hongji Li
- Key Laboratory of Green and Precise Synthetic Chemistry and Application Ministry of Education; School of Chemistry and Material Science, Huaibei Normal University Huaibei, Anhui 235000 P. R. China
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2
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Quasdorf KW, Birkholz AB, Bartberger MD, Colyer J, Osgood S, Crossley K, Caille S. Mechanistic Insights into the Racemization of Fused Cyclopropyl Isoxazolines. Org Lett 2020; 22:2113-2117. [PMID: 31859518 DOI: 10.1021/acs.orglett.9b04236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Experimental and computational studies of the unexpected racemization of enantiopure fused cyclopropyl isoxazolines are reported. These studies offer insights into the mechanism of racemization, quantify the position of the transition state on the dipolar-diradical continuum, and establish a relationship between the structure and stability of this class of compounds. Experimental and computed energy barriers for racemization are also presented.
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Affiliation(s)
- Kyle W Quasdorf
- Departments of Chemical Process Research and Development and Therapeutic Discovery, Amgen, Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
| | - Adam B Birkholz
- Departments of Chemical Process Research and Development and Therapeutic Discovery, Amgen, Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
| | - Michael D Bartberger
- 1200 Pharma LLC, 844 East Green Street, Suite 204, Pasadena, California 91101, United States
| | - John Colyer
- Departments of Chemical Process Research and Development and Therapeutic Discovery, Amgen, Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
| | - Stephen Osgood
- Departments of Chemical Process Research and Development and Therapeutic Discovery, Amgen, Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
| | - Kevin Crossley
- Departments of Chemical Process Research and Development and Therapeutic Discovery, Amgen, Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
| | - Seb Caille
- Departments of Chemical Process Research and Development and Therapeutic Discovery, Amgen, Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
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3
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Ismail T, Shafi S, Singh S, Sidiq T, Khajuria A, Rouf A, Yadav M, Saikam V, Singh PP, Alam MS, Islam N, Sharma K, Kumar HMS. Synthesis and immunopotentiating activity of novel isoxazoline functionalized coumarins. Eur J Med Chem 2016; 123:90-104. [PMID: 27474926 DOI: 10.1016/j.ejmech.2016.07.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 06/29/2016] [Accepted: 07/12/2016] [Indexed: 10/21/2022]
Abstract
A novel series (13) of isoxazoline functionalized coumarins was synthesized through 1,3-dipolar cyclization of nitrile oxides with Allylated coumarins. Synthesis of effective and target selective immunostimulators through conjugation of diversely substituted isoxazolines and 7-hydroxycoumarins is the focus of the present article. The proposed synthetic scheme was observed to be highly regiospecific yielding attempted conjugates in good yield (>90%). Kinetic resolution of the racemates was carried out by employing lipase B from Candida antarctica (CALB). The synthesized compounds were screened in vitro and in vivo for their biological activities viz. toxicity and impact on splenocyte proliferation (T- and B-cell proliferation), antibody production (HA titre), delayed-type hypersensitivity reaction (DTH), T-cell subtypes (CD4 and CD8), cytokine production (IL-2, IFN-γ, and IL-4) and NO (macrophage) production. Our results establish that isoxazoline functionalized coumarins exhibit excellent immune potentiating activity especially compounds 2, 4 and 8 whose activity is more than that of Levimasole as standard. The structure activity relations are explained in light of the structural/functional aspects of tested compounds. To the best of our knowledge the presented work is first of its kind and is presaged to prove very useful for the design and synthesis of bis-heterocycle based novel, therapeutically selective and effective immunopotentiators.
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Affiliation(s)
- Tabasum Ismail
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine, Jammu, India.
| | - Syed Shafi
- Department of Chemistry, Jamia Hamdard University, New Delhi, India
| | - Swarn Singh
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine, Jammu, India
| | - Tabasum Sidiq
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine, Jammu, India
| | - Anamika Khajuria
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine, Jammu, India
| | - Abdul Rouf
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine, Jammu, India
| | - Mahipal Yadav
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine, Jammu, India
| | - Varma Saikam
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine, Jammu, India
| | - Parvinder Pal Singh
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine, Jammu, India
| | | | - Nasarul Islam
- Department of Chemistry, Guru Nanak Dev University, Amritsar, India
| | - Kalicharan Sharma
- Department of Pharmaceutical Chemistry, Jamia Hamdard University, New Delhi, India
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Kitamoto Y, Kuruma Y, Suzuki K, Hattori T. Effect of Solvent Polarity on Enantioselectivity in Candida Antarctica Lipase B Catalyzed Kinetic Resolution of Primary and Secondary Alcohols. J Org Chem 2014; 80:521-7. [DOI: 10.1021/jo502521e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Yuichi Kitamoto
- Department of Biomolecular
Engineering, Graduate School of Engineering, Tohoku University, 6-6-11
Aramaki-Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Yosuke Kuruma
- Department of Biomolecular
Engineering, Graduate School of Engineering, Tohoku University, 6-6-11
Aramaki-Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Kazumi Suzuki
- Department of Biomolecular
Engineering, Graduate School of Engineering, Tohoku University, 6-6-11
Aramaki-Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Tetsutaro Hattori
- Department of Biomolecular
Engineering, Graduate School of Engineering, Tohoku University, 6-6-11
Aramaki-Aoba, Aoba-ku, Sendai 980-8579, Japan
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Akai S, Nemoto H, Egi M. Enantioselective Synthesis of Both Enantiomers of Etodolac via a Lipase-Catalyzed Kinetic Resolution. HETEROCYCLES 2008. [DOI: 10.3987/com-08-s(n)118] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Yamamoto H, Hayashi S, Kubo M, Harada M, Hasegawa M, Noguchi M, Sumimoto M, Hori K. Asymmetric 1,3-Dipolar Cycloaddition Reactions of Benzonitrile Oxide Mediated by a Chiral Lewis Acid. European J Org Chem 2007. [DOI: 10.1002/ejoc.200601014] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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