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Wu H, Hong P, Xi W, Li J. Divergent Synthesis of gem-Difluorinated Oxa-Spirocyclohexadienones by One-Pot Sequential Reactions of p-Hydroxybenzyl Alcohols with Difluoroenoxysilanes. Org Lett 2022; 24:2488-2493. [PMID: 35344353 DOI: 10.1021/acs.orglett.2c00550] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A new efficient formal [2 + 3] cyclization of p-hydroxybenzyl alcohols with difluoroenoxysilanes has been established. This convenient one-pot sequential procedure enables the divergent construction of highly functionalized gem-difluorinated oxa-spirocyclohexadienones under mild conditions. As opposed to the common C1 synthons in previous studies, difluoroenoxysilanes acted as new 3-atom (CCO) synthons for the first time here. The AcOH and H2O generated in the reaction are critical for the reactions to proceed smoothly.
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Affiliation(s)
- Haijian Wu
- Advanced Research Institute and Department of Chemistry, Taizhou University, Jiaojiang, Zhejiang 318000, P. R. China
| | - Peng Hong
- Advanced Research Institute and Department of Chemistry, Taizhou University, Jiaojiang, Zhejiang 318000, P. R. China
| | - Wenxue Xi
- Advanced Research Institute and Department of Chemistry, Taizhou University, Jiaojiang, Zhejiang 318000, P. R. China
| | - Jinshan Li
- Advanced Research Institute and Department of Chemistry, Taizhou University, Jiaojiang, Zhejiang 318000, P. R. China
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2
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Nair AM, Halder I, Sharma R, Volla CMR. Water Mediated Rearrangement of Alkynyl Cyclohexadienones: Access to meta-Alkenylated Phenols. Org Lett 2021; 23:1840-1845. [DOI: 10.1021/acs.orglett.1c00245] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Akshay M. Nair
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Indranil Halder
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Ritu Sharma
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Chandra M. R. Volla
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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3
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Takubo K, A B Mohamed A, Ide T, Saito K, Ikawa T, Yoshimitsu T, Akai S. Regioselective Rearrangement of 4,4-Disubstituted 2-Hydroxycyclohexa-2,5-Dienones under Deoxyfluorination Conditions. J Org Chem 2017; 82:13141-13151. [PMID: 29099595 DOI: 10.1021/acs.joc.7b02208] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dienone-phenol rearrangement is a useful tool for the synthesis of highly substituted phenols. In our previous study of the rearrangement of 4,4-disubstituted 2-hydroxycyclohexa-2,5-dienone under deoxyfluorination conditions, bond migration proceeded with very poor regioselectivity. In this paper, an acid-mediated rearrangement of O-perfluoroalkylsulfonyl difluorides with regioselective migration toward the β'-carbon is reported. This method allowed the synthesis of a fluorinated analog of allocolchicinoids with improved total yield. Successful application to other substrates was also demonstrated.
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Affiliation(s)
- Keita Takubo
- Graduate School of Pharmaceutical Sciences, Osaka University , 1-6, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Ahmed A B Mohamed
- Graduate School of Pharmaceutical Sciences, Osaka University , 1-6, Yamadaoka, Suita, Osaka 565-0871, Japan.,Faculty of Pharmacy, University of Mansoura , Mansoura 35516, Egypt
| | - Takafumi Ide
- School of Pharmaceutical Sciences, University of Shizuoka , 52-1, Yada, Suruga-ku, Shizuoka, Shizuoka 422-8526, Japan
| | - Kazuyuki Saito
- Graduate School of Pharmaceutical Sciences, Osaka University , 1-6, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Takashi Ikawa
- Graduate School of Pharmaceutical Sciences, Osaka University , 1-6, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Takehiko Yoshimitsu
- Graduate School of Pharmaceutical Sciences, Osaka University , 1-6, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Shuji Akai
- Graduate School of Pharmaceutical Sciences, Osaka University , 1-6, Yamadaoka, Suita, Osaka 565-0871, Japan
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4
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Abstract
The dienone-phenol rearrangement of 4,4-disubstituted cyclohexadienones to multi-substituted phenols is achieved by employing Re2O7as the catalyst.
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Affiliation(s)
- Zilei Xia
- Department of Medicinal Chemistry & State Key Laboratory of Natural Medicines
- Center of Drug Discovery
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Jiadong Hu
- Department of Medicinal Chemistry & State Key Laboratory of Natural Medicines
- Center of Drug Discovery
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Zhigao Shen
- Department of Medicinal Chemistry & State Key Laboratory of Natural Medicines
- Center of Drug Discovery
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Qizheng Yao
- Department of Medicinal Chemistry & State Key Laboratory of Natural Medicines
- Center of Drug Discovery
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Weiqing Xie
- Shaanxi Key Laboratory of Natural Products & Chemical Biology
- College of Science
- Northwest A&F University
- China
- State Key Laboratory of Bioorganic & Natural Products Chemistry
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5
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Liu X, Pan L, Dong J, Xu X, Zhang Q, Liu Q. 1,3-Carbothiolation of 4-(Trifluoromethyl)-p-Quinols: A New Access to Functionalized (Trifluoromethyl)arenes. Org Lett 2013; 15:6242-5. [DOI: 10.1021/ol403096g] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Xiao Liu
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Ling Pan
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Jinhuan Dong
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Xianxiu Xu
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Qian Zhang
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Qun Liu
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
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6
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Ding Z, Xue S, Wulff WD. A succinct synthesis of the vaulted biaryl ligand vanol via a dienone-phenol rearrangement. Chem Asian J 2011; 6:2130-46. [PMID: 21598399 DOI: 10.1002/asia.201000804] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Indexed: 11/10/2022]
Abstract
Vanol is a member of the vaulted biaryl family of ligands and it has been proven to be very effective in a number of asymmetric catalytic reactions. The previous synthesis of vanol, while effective, is limited by the cost of reagents involved. The present work evaluates three different approaches to the synthesis of 3-phenyl-1-naphthol, a key intermediate in the synthesis of vanol. The first approach has its key step as the Michael addition of a benzyl Grignard to methyl cinnamate. In the second approach the key step is the first step, a Reformatsky reaction of ethyl bromoacetate and deoxybenzoin. The final and most-efficient approach involves a dienone-phenol rearrangement of a 4-aryl-1-tetralenone generated in-situ from the reaction of 4-chloro-1-naphthol with AlCl(3) and benzene, and preliminary results are reported on the extension of this method to substituted vanol derivatives.
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Affiliation(s)
- Zhensheng Ding
- Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA
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Liang H, Ciufolini MA. Oxidative spirocyclization of phenolic sulfonamides: scope and applications. Chemistry 2011; 16:13262-70. [PMID: 20931573 DOI: 10.1002/chem.201001402] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A full account of the oxidative dearomatization of para- and ortho-phenolic sulfonamides is provided together with an overview of the chemistry of the products and their elaboration to building blocks for spirocyclic alkaloids. A concise total synthesis of putative lepadiformine complements the discussion.
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Affiliation(s)
- Huan Liang
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
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