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Li P, Mi L, Liu Y, Zhang W, Shi XL. Synergistic catalysis of bifunctional polyacrylonitrile fiber for the synthesis of (E)-α,β-unsaturated esters from aldehydes by decarboxylative Doebner–Knoevenagel reaction. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2019.09.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Ozeki M, Hachino A, Shigeta T, Niki A, Kobayashi N, Mizutani H, Nakamura A, Horie A, Arimitsu K, Kajimoto T, Hosoi S, Iwasaki H, Kojima N, Yamashita M, Kawasaki I. A Facile and Convenient Synthesis of Trisubstituted (<i>E</i>)-α,β-Unsaturated Esters by Tandem Acetylation-E1cB Reaction. Chem Pharm Bull (Tokyo) 2019; 67:71-74. [DOI: 10.1248/cpb.c18-00666] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Minoru Ozeki
- Department of Medicinal and Synthetic Chemistry, Faculty of Pharmaceutical Sciences, Mukogawa Women’s University
| | - Ayumi Hachino
- Department of Medicinal and Synthetic Chemistry, Faculty of Pharmaceutical Sciences, Mukogawa Women’s University
| | - Takashi Shigeta
- Department of Medicinal and Synthetic Chemistry, Faculty of Pharmaceutical Sciences, Mukogawa Women’s University
| | - Aya Niki
- Department of Medicinal and Synthetic Chemistry, Faculty of Pharmaceutical Sciences, Mukogawa Women’s University
| | - Natsuko Kobayashi
- Department of Medicinal and Synthetic Chemistry, Faculty of Pharmaceutical Sciences, Mukogawa Women’s University
| | - Hideki Mizutani
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Akihiro Nakamura
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Ayano Horie
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Kenji Arimitsu
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Tetsuya Kajimoto
- Medicinal Organic Chemistry Laboratory, College of Pharmaceutical Sciences, Ritsumeikan University
| | - Shinzo Hosoi
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Hiroki Iwasaki
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Naoto Kojima
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Masayuki Yamashita
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Ikuo Kawasaki
- Department of Medicinal and Synthetic Chemistry, Faculty of Pharmaceutical Sciences, Mukogawa Women’s University
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Kumar A, Khan S, Ahmed QN. Base-Controlled Reactions through an Aldol Intermediate Formed between 2-Oxoaldehydes and Malonate Half Esters. Org Lett 2017; 19:4730-4733. [PMID: 28876954 DOI: 10.1021/acs.orglett.7b02016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A practical, atom-economical, base-directed, and highly efficient method for the generation of different selective products through a common aldol intermediate of 2-oxoaldehydes and malonate half esters is successfully developed. The addition of a strong basic environment (potassium tert-butoxide) catalyzed the synthesis of stable decarboxylative aldol products (α-hydroxy ketones), while the Doebner modification procedure resulted in decarboxylative elimination to (E)-α,β-unsaturated esters in good yields. The application of this method in one pot and one pot/two steps with azoles helped to develop regioselective α- and β-azolated products in appreciable yields.
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Affiliation(s)
- Atul Kumar
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine (IIIM) , Jammu 180001, India.,Academy of Scientific and Innovative Research (AcSIR-IIIM) , Jammu 180001, India
| | - Shahnawaz Khan
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine (IIIM) , Jammu 180001, India.,Academy of Scientific and Innovative Research (AcSIR-IIIM) , Jammu 180001, India
| | - Qazi Naveed Ahmed
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine (IIIM) , Jammu 180001, India.,Academy of Scientific and Innovative Research (AcSIR-IIIM) , Jammu 180001, India
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The Orthoester Johnson-Claisen Rearrangement in the Synthesis of Bioactive Molecules, Natural Products, and Synthetic Intermediates - Recent Advances. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301033] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Chintareddy VR, Ellern A, Verkade JG. P[N(i-Bu)CH(2)CH(2)](3)N: nonionic Lewis base for promoting the room-temperature synthesis of α,β-unsaturated esters, fluorides, ketones, and nitriles using Wadsworth-Emmons phosphonates. J Org Chem 2011; 75:7166-74. [PMID: 20945858 DOI: 10.1021/jo1012515] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The bicyclic triaminophosphine P(RNCH(2)CH(2))(3)N (R = i-Bu, 1c) serves as an effective promoter for the room-temperature stereoselective synthesis of α,β-unsaturated esters, fluorides, and nitriles from a wide array of aromatic, aliphatic, heterocyclic, and cyclic aldehydes and ketones, using a range of Wadsworth-Emmons (WE) phosphonates. Among the analogues of 1c [R = Me (1a), i-Pr (1b), Bn (1d)], 1a and 1b performed well, although longer reaction times were involved, and 1d led to poorer yields than 1c. Functionalities such as cyano, chloro, bromo, methoxy, amino, ester, and nitro were well tolerated. We were able to isolate and characterize (by X-ray means; see above) the reactive WE intermediate species formed from 2b and 1c.
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Manzano R, Ozores L, Job A, Rodefeld L, List B. Catalytic synthesis of (E)-alpha,beta-unsaturated esters from aldehydes and 1,1-diethoxyethylene. Beilstein J Org Chem 2009; 5:3. [PMID: 19259339 PMCID: PMC2649438 DOI: 10.3762/bjoc.5.3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2008] [Accepted: 01/26/2009] [Indexed: 11/23/2022] Open
Abstract
A practical and high yielding synthesis of α,β-unsaturated esters from aldehydes and 1,1-diethoxyethylene was developed.
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Affiliation(s)
- Rubén Manzano
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
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List B, Doehring A, Hechavarria Fonseca MT, Job A, Rios Torres R. A Practical, efficient, and atom economic alternative to the Wittig and Horner–Wadsworth–Emmons reactions for the synthesis of (E)-α,β-unsaturated esters from aldehydes. Tetrahedron 2006. [DOI: 10.1016/j.tet.2005.09.081] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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List B, Doehring A, Fonseca M, Wobser K, van Thienen H, Torres R, Galilea P. Practical Synthesis of (E)-α,β-Unsaturated Esters from Aldehydes. Adv Synth Catal 2005. [DOI: 10.1002/adsc.200505196] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Feuillet FJP, Cheeseman M, Mahon MF, Bull SD. Stereoselective synthesis of (E)-trisubstituted α,β-unsaturated amides and acids. Org Biomol Chem 2005; 3:2976-89. [PMID: 16186928 DOI: 10.1039/b503633j] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Potassium alkoxides of N-acyl-oxazolidin-2-one-syn-aldols undergo stereoselective elimination reactions to afford a range of trisubstituted (E)-alpha,beta-unsaturated amides in >95% de, that may be subsequently converted into their corresponding (E)-alpha,beta-unsaturated acids or (E)-alpha,beta-unsaturated oxazolines in good yield. syn-Aldols derived from alpha,beta-unsaturated aldehydes gave their corresponding trisubstituted (E)-alpha,beta-unsaturated-amides with poorer levels of diastereocontrol, whilst there was a similar loss in (E)-selectivity during elimination of syn-aldols derived from chiral aldehydes. These elimination reactions proceed via rearrangement of the potassium alkoxide of the syn-aldol to a 1,3-oxazinane-2,4-dione enolate intermediate that subsequently eliminates carbon dioxide to afford a trisubstituted (E)-alpha,beta-unsaturated amide. The (E)-selectivity observed during the E1cB-type elimination step has been rationalised using a simple conformational model that employs a chair-like transition state to explain the observed stereocontrol.
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Verkade JG, Kisanga PB. Proazaphosphatranes: a synthesis methodology trip from their discovery to vitamin A. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)01204-3] [Citation(s) in RCA: 131] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Huang ZZ, Tang Y. Unexpected catalyst for Wittig-type and dehalogenation reactions. J Org Chem 2002; 67:5320-6. [PMID: 12126422 DOI: 10.1021/jo025693b] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel catalyst 2 for Wittig-type and dehalogenation reactions was developed. In the presence of triphenyl phosphite, a wide variety of aldehydes could react with alpha-bromoacetates to afford alpha,beta-unsaturated esters or ketones in high yields with excellent E-stereoselectivity when 1-2 mol % of compound 2 was used. Compound 2 was also an effective catalyst for reductive dehalogenation of alpha-bromocarbonyl compounds. The mechanisms for the above reactions were also proposed.
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Affiliation(s)
- Zheng-Zheng Huang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, 354 Fenglin Lu, Shanghai 200032, China
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Kisanga PB, Ilankumaran P, Fetterly BM, Verkade JG. P(RNCH(2)CH(2))(3)N: efficient 1,4-addition catalysts. J Org Chem 2002; 67:3555-60. [PMID: 12027665 DOI: 10.1021/jo010228k] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
The 1,4-addition of primary alcohols, higher nitroalkanes, and a Schiff's base of an alpha-amino ester to alpha,beta-unsaturated substrates produces the corresponding products in moderate to excellent yields when carried out at -63 to 70 degrees C in the presence of catalytic amounts of the nonionic strong bases P(RNCH(2)CH(2))(3)N (R = Me, i-Pr, i-Bu) in isobutyronitrile. Diastereoselectivity for the anti form of the product is high in the case of the Schiff's base in the absence of lithium ion. These catalysts are easily removed from the product by either column filtration through silica gel or via aqueous workup.
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Affiliation(s)
- Philip B Kisanga
- Department of Chemistry, Gilman Hall, Iowa State University, Ames, IA 50011, USA
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