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Umemiya S, Shinagawa N, Terada M. Scalable Total Synthesis of Leucascandrolide A Macrolactone Using a Chiral Phosphoric Acid/CuX Combined Catalytic System. Org Lett 2023; 25:1924-1928. [PMID: 36920186 DOI: 10.1021/acs.orglett.3c00450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
A scalable total synthesis of leucascandrolide A macrolactone has been accomplished with a longest linear sequence of 17 steps from readily available feedstocks in 31.2% yield. The key steps in this synthesis are the enantioselective allylation reaction by chiral phosphoric acid (CPA)/CuBr cooperative catalysis and the diastereoselective catalytic crotylation in the presence of CPA with CuCl. These catalytic reactions can be performed on a gram scale to afford the desired products with excellent stereoselectivities.
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Affiliation(s)
- Shigenobu Umemiya
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Naoya Shinagawa
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Masahiro Terada
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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2
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Tanaka I, Sawamura M, Shimizu Y. Visible Light-Induced Reductive Alkynylation of Aldehydes by Umpolung Approach. Org Lett 2021; 24:520-524. [PMID: 34965142 DOI: 10.1021/acs.orglett.1c03927] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reductive alkynylation of aldehydes by the Umpolung approach was developed using a photoredox catalyst under blue LED irradiation. Ketyl radicals, generated by single-electron reduction of aldehydes through proton-coupled electron transfer (PCET), reacted with electrophilic alkynylsulfones. Sterically demanding bulky aldehydes reacted smoothly under the Umpolung reaction conditions. Moreover, the alkynylation proceeded chemoselectively with an aryl aldehyde group in the presence of other carbonyl groups including an aliphatic aldehyde group.
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Affiliation(s)
- Ibuki Tanaka
- Department of Chemistry, Faculty of Science, Hokkaido University, Kita 10 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| | - Masaya Sawamura
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Kita 21 Nishi 10, Kita-ku, Sapporo, Hokkaido 001-0021, Japan.,Department of Chemistry, Faculty of Science, Hokkaido University, Kita 10 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| | - Yohei Shimizu
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Kita 21 Nishi 10, Kita-ku, Sapporo, Hokkaido 001-0021, Japan.,Department of Chemistry, Faculty of Science, Hokkaido University, Kita 10 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
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Weeks KL, Williams JD, Boyce GR. A three-step enantioselective synthesis of (+)- and (-)-α-thujone. Org Biomol Chem 2021; 19:8018-8020. [PMID: 34596203 DOI: 10.1039/d1ob01505b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The stereocontrolled three-step synthesis of either enantiomer of α-thujone from commercially available 3-methyl-1-butyne is described. The enantioselectivity originates from a Brown crotylation which is then conferred to the all-carbon quaternary center via chirality transfer in a gold-catalyzed cycloisomerization. The route is highly atom economical and requires no protecting groups or redox manipulations.
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Affiliation(s)
- Kellie L Weeks
- Department of Chemistry and Physics, Florida Gulf Coast University, Fort Myers, Florida 33965, USA.
| | - Jack D Williams
- Department of Chemistry, Mercyhurst University, Erie, Pennsylvania 16546, USA
| | - Gregory R Boyce
- Department of Chemistry and Physics, Florida Gulf Coast University, Fort Myers, Florida 33965, USA.
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Umemiya S, Terada M. Catalytic Enantioselective Allylation of Acetylenic Aldehydes by Chiral Phosphoric Acid/Transition Metal Cooperative Catalysis: Formal Synthesis of Fostriecin. Org Lett 2021; 23:3767-3771. [PMID: 33890790 DOI: 10.1021/acs.orglett.1c01166] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An enantioselective allylation of silyl-substituted acetylenic aldehydes by chiral phosphoric acid (CPA)/transition metal cooperative catalysis was developed. Enantioenriched homoallylic propargyl alcohols were obtained in good yields with excellent enantioselectivities (>99% ee) under mild conditions. Moreover, the shortest formal synthesis of fostriecin was achieved by the present enantioselective allylation protocol as the key step. The known intermediate of fostriecin reported by McDonald and co-worker was synthesized in only nine steps in 39% total yield.
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Affiliation(s)
- Shigenobu Umemiya
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Masahiro Terada
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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Yuan J, Jain P, Antilla JC. Bi(cyclopentyl)diol-Derived Boronates in Highly Enantioselective Chiral Phosphoric Acid-Catalyzed Allylation, Propargylation, and Crotylation of Aldehydes. J Org Chem 2020; 85:12988-13003. [PMID: 32960066 DOI: 10.1021/acs.joc.0c01646] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In this study, we disclose the catalytic addition of bi(cyclopentyl)diol-derived boronates to aldehydes promoted by chiral phosphoric acids, allowing for the formation of enantioenriched homoallylic, propargylic, and crotylic alcohols (up to >99% enantiomeric excess (ee), diastereomeric ratio (dr) >20:1). These boronate substrates provided superior enantioselectivities, allowing for the reactions to proceed with low catalyst loading (0.5-5 mol %) and reduced reaction time (15 min at room temperature for aldehyde allylboration). A wide substrate scope was exhibited, and the novel boronates provided high enantiocontrol. Reactions with substituted allylboronates and aldehydes yielded vicinal stereogenic alcohols bearing β-tertiary or quaternary carbon centers. High enantio- and diastereoselectivities were found due to the closed six-membered chair-like transition state, with backbone modifications of the boronate and its interactions with the chiral phosphoric acid being the most likely contributing factor.
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Affiliation(s)
- Jinping Yuan
- Institute for Molecular Design and Synthesis, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Pankaj Jain
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - Jon C Antilla
- Institute for Molecular Design and Synthesis, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China.,School of Sciences, Zhejiang Sci-Tech University, Hangzhou City, Zhejiang Province 310018, China
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6
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Brito GA, Della-Felice F, Luo G, Burns AS, Pilli RA, Rychnovsky SD, Krische MJ. Catalytic Enantioselective Allylations of Acetylenic Aldehydes via 2-Propanol-Mediated Reductive Coupling. Org Lett 2018; 20:4144-4147. [PMID: 29938513 PMCID: PMC6205292 DOI: 10.1021/acs.orglett.8b01776] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cyclometalated π-allyliridium C,O-benzoates modified by ( S)-SEGPHOS or ( S)-Cl,OMe-BIPHEP catalyze enantioselective 2-propanol-mediated reductive couplings of diverse nonmetallic allyl pronucleophiles with the acetylenic aldehyde TIPSC≡CCHO. Absolute stereochemistries of the resulting secondary homoallylic-propargylic alcohols were assigned using Rychnovsky's competing enantioselective conversion method.
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Affiliation(s)
- Gilmar A Brito
- Department of Chemistry , University of Texas at Austin , Austin , Texas 78712 , United States
- Institute of Chemistry, University of Campinas (UNICAMP) , P.O. Box 6154, CEP, 13083-970 Campinas , São Paulo , Brazil
| | - Franco Della-Felice
- Department of Chemistry , University of Texas at Austin , Austin , Texas 78712 , United States
- Institute of Chemistry, University of Campinas (UNICAMP) , P.O. Box 6154, CEP, 13083-970 Campinas , São Paulo , Brazil
| | - Guoshun Luo
- Department of Chemistry , University of Texas at Austin , Austin , Texas 78712 , United States
| | - Alexander S Burns
- Department of Chemistry , University of California at Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
| | - Ronaldo A Pilli
- Institute of Chemistry, University of Campinas (UNICAMP) , P.O. Box 6154, CEP, 13083-970 Campinas , São Paulo , Brazil
| | - Scott D Rychnovsky
- Department of Chemistry , University of California at Irvine , 1102 Natural Sciences II , Irvine , California 92697 , United States
| | - Michael J Krische
- Department of Chemistry , University of Texas at Austin , Austin , Texas 78712 , United States
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Baxter M, Bolshan Y. A General Access to Propargylic Ethers through Brønsted Acid Catalyzed Alkynylation of Acetals and Ketals with Trifluoroborates. Chemistry 2015; 21:13535-8. [DOI: 10.1002/chem.201502797] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Indexed: 11/10/2022]
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Asami M, Zhong L, Sekiguchi N, Yamada K, Hiwatashi Y, Taniguchi T, Hosoda N, Ito S. Optical Resolution of C2-Symmetric Racemic 1,4-Diols with o-Xylylene Structure by Chiral Resolving Agent ( S)-ALBO-V. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2015. [DOI: 10.1246/bcsj.20150066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Masatoshi Asami
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University
| | - Lvling Zhong
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University
| | - Naoki Sekiguchi
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University
| | - Kumiko Yamada
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University
| | - Yuya Hiwatashi
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University
| | - Toshiro Taniguchi
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University
| | - Naoya Hosoda
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University
| | - Suguru Ito
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University
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Huo HX, Duvall JR, Huang MY, Hong R. Catalytic asymmetric allylation of carbonyl compounds and imines with allylic boronates. Org Chem Front 2014. [DOI: 10.1039/c3qo00081h] [Citation(s) in RCA: 153] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Enantioselective allylation is a highly used organic reaction to prepare chiral homoallylic alcohols and amines, which serve as important building blocks in the synthesis of a variety of natural products and pharmaceuticals.
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Affiliation(s)
- Hua-Xing Huo
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai 200032, China
| | | | - Meng-Yuan Huang
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai 200032, China
| | - Ran Hong
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai 200032, China
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