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Chen P, Wang C, Yang R, Xu H, Wu J, Jiang H, Chen K, Ma Z. Asymmetric Total Synthesis of Dankasterones A and B and Periconiastone A Through Radical Cyclization. Angew Chem Int Ed Engl 2021; 60:5512-5518. [PMID: 33206427 DOI: 10.1002/anie.202013881] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Indexed: 12/11/2022]
Abstract
We describe herein the assembly of the cis-decalin framework through radical cyclization initiated by metal-catalyzed hydrogen atom transfer (MHAT), further applied it in the asymmetric synthesis of dankasterones A and B and periconiastone A. Position-selective C-H oxygenation allowed for installation of the necessary functionality. A radical rearrangement was adopted to create 13(14→8)abeo-8-ergostane skeleton. Interconversion of dankasterone B and periconiastone A was realized through biomimetic intramolecular aldol and retro-aldol reactions. The MHAT-based approach, serves as a new dissection means, is complementary to the conventional ways to establish cis-decalin framework.
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Affiliation(s)
- Pengquan Chen
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry & Chemical Engineering, South China University of Technology, Wushan Road-381, Guangzhou, 510641, China
| | - Cheng Wang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry & Chemical Engineering, South China University of Technology, Wushan Road-381, Guangzhou, 510641, China
| | - Rui Yang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry & Chemical Engineering, South China University of Technology, Wushan Road-381, Guangzhou, 510641, China
| | - Hongjin Xu
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry & Chemical Engineering, South China University of Technology, Wushan Road-381, Guangzhou, 510641, China
| | - Jinghua Wu
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry & Chemical Engineering, South China University of Technology, Wushan Road-381, Guangzhou, 510641, China
| | - Huanfeng Jiang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry & Chemical Engineering, South China University of Technology, Wushan Road-381, Guangzhou, 510641, China
| | - Kai Chen
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China.,Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen, 518055, China
| | - Zhiqiang Ma
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry & Chemical Engineering, South China University of Technology, Wushan Road-381, Guangzhou, 510641, China
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2
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Chen P, Wang C, Yang R, Xu H, Wu J, Jiang H, Chen K, Ma Z. Asymmetric Total Synthesis of Dankasterones A and B and Periconiastone A Through Radical Cyclization. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202013881] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Pengquan Chen
- Key Lab of Functional Molecular Engineering of Guangdong Province School of Chemistry & Chemical Engineering South China University of Technology Wushan Road-381 Guangzhou 510641 China
| | - Cheng Wang
- Key Lab of Functional Molecular Engineering of Guangdong Province School of Chemistry & Chemical Engineering South China University of Technology Wushan Road-381 Guangzhou 510641 China
| | - Rui Yang
- Key Lab of Functional Molecular Engineering of Guangdong Province School of Chemistry & Chemical Engineering South China University of Technology Wushan Road-381 Guangzhou 510641 China
| | - Hongjin Xu
- Key Lab of Functional Molecular Engineering of Guangdong Province School of Chemistry & Chemical Engineering South China University of Technology Wushan Road-381 Guangzhou 510641 China
| | - Jinghua Wu
- Key Lab of Functional Molecular Engineering of Guangdong Province School of Chemistry & Chemical Engineering South China University of Technology Wushan Road-381 Guangzhou 510641 China
| | - Huanfeng Jiang
- Key Lab of Functional Molecular Engineering of Guangdong Province School of Chemistry & Chemical Engineering South China University of Technology Wushan Road-381 Guangzhou 510641 China
| | - Kai Chen
- College of Chemistry and Chemical Engineering Central South University Changsha 410083 China
- Lab of Computational Chemistry and Drug Design State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen 518055 China
| | - Zhiqiang Ma
- Key Lab of Functional Molecular Engineering of Guangdong Province School of Chemistry & Chemical Engineering South China University of Technology Wushan Road-381 Guangzhou 510641 China
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3
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Balkenhohl M, Jangra H, Makarov IS, Yang S, Zipse H, Knochel P. A Predictive Model Towards Site-Selective Metalations of Functionalized Heterocycles, Arenes, Olefins, and Alkanes using TMPZnCl⋅LiCl. Angew Chem Int Ed Engl 2020; 59:14992-14999. [PMID: 32400069 PMCID: PMC7497272 DOI: 10.1002/anie.202005372] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Indexed: 01/02/2023]
Abstract
The development of a predictive model towards site-selective deprotometalation reactions using TMPZnCl⋅LiCl is reported (TMP=2,2,6,6-tetramethylpiperidinyl). The pKa values of functionalized N-, S-, and O-heterocycles, arenes, alkenes, or alkanes were calculated and compared to the experimental deprotonation sites. Large overlap (>80 %) between the calculated and empirical deprotonation sites was observed, showing that thermodynamic factors strongly govern the metalation regioselectivity. In the case of olefins, calculated frozen state energies of the deprotonated substrates allowed a more accurate prediction. Additionally, various new N-heterocycles were analyzed and the metalation regioselectivities rationalized using the predictive model.
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Affiliation(s)
- Moritz Balkenhohl
- Department of ChemistryLudwig-Maximilians-Universität MünchenButenandtstr. 5–1381377MunichGermany
| | - Harish Jangra
- Department of ChemistryLudwig-Maximilians-Universität MünchenButenandtstr. 5–1381377MunichGermany
| | - Ilya S. Makarov
- Department of ChemistryLudwig-Maximilians-Universität MünchenButenandtstr. 5–1381377MunichGermany
| | - Shu‐Mei Yang
- Department of ChemistryNational (Taiwan) Normal University88, Sec. 4, Tingchow RoadTaipei11677Taiwan, Republic of China
| | - Hendrik Zipse
- Department of ChemistryLudwig-Maximilians-Universität MünchenButenandtstr. 5–1381377MunichGermany
| | - Paul Knochel
- Department of ChemistryLudwig-Maximilians-Universität MünchenButenandtstr. 5–1381377MunichGermany
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4
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Balkenhohl M, Jangra H, Makarov IS, Yang S, Zipse H, Knochel P. A Predictive Model Towards Site‐Selective Metalations of Functionalized Heterocycles, Arenes, Olefins, and Alkanes using TMPZnCl⋅LiCl. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005372] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Moritz Balkenhohl
- Department of Chemistry Ludwig-Maximilians-Universität München Butenandtstr. 5–13 81377 Munich Germany
| | - Harish Jangra
- Department of Chemistry Ludwig-Maximilians-Universität München Butenandtstr. 5–13 81377 Munich Germany
| | - Ilya S. Makarov
- Department of Chemistry Ludwig-Maximilians-Universität München Butenandtstr. 5–13 81377 Munich Germany
| | - Shu‐Mei Yang
- Department of Chemistry National (Taiwan) Normal University 88, Sec. 4, Tingchow Road Taipei 11677 Taiwan, Republic of China
| | - Hendrik Zipse
- Department of Chemistry Ludwig-Maximilians-Universität München Butenandtstr. 5–13 81377 Munich Germany
| | - Paul Knochel
- Department of Chemistry Ludwig-Maximilians-Universität München Butenandtstr. 5–13 81377 Munich Germany
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5
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Samala M, Lu TN, Mandava S, Hwang J, Bogonda G, Kim D, Park H, Kim D, Lee J. Stereoselective Protection-Free Asymmetric Total Synthesis of (+)-Chamuvarinin, a Potent Anticancer and Antitrypanosomal Agent: Substrate-Controlled Construction of the Adjacently Linked Oxatricyclic Core by Internal Alkylation. Org Lett 2018; 20:6398-6402. [DOI: 10.1021/acs.orglett.8b02706] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mallesham Samala
- College of Pharmacy, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon-do 24341, Republic of Korea
| | - Thien Nhan Lu
- College of Pharmacy, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon-do 24341, Republic of Korea
| | - Suresh Mandava
- College of Pharmacy, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon-do 24341, Republic of Korea
| | - Jungjoong Hwang
- College of Pharmacy, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon-do 24341, Republic of Korea
| | - Ganganna Bogonda
- College of Pharmacy, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon-do 24341, Republic of Korea
| | - Donghoon Kim
- College of Pharmacy, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon-do 24341, Republic of Korea
| | - Haeil Park
- College of Pharmacy, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon-do 24341, Republic of Korea
| | - Deukjoon Kim
- College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Jongkook Lee
- College of Pharmacy, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon-do 24341, Republic of Korea
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6
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Sasaki M, Shimabara R, Takegawa T, Kotomori Y, Otani Y, Ohwada T, Takeda K. Steric Course of Deprotonation/Substitution of Chelating/Dipole-Stabilizing-Group-Substituted α-Amino- and α-Oxynitriles. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Michiko Sasaki
- Department of Synthetic Organic Chemistry; Institute of Biomedical & Health Science; Hiroshima University; 1-2-3 Kasumi 734-8553 Minami-Ku, Hiroshima Japan
| | - Rumiko Shimabara
- Department of Synthetic Organic Chemistry; Institute of Biomedical & Health Science; Hiroshima University; 1-2-3 Kasumi 734-8553 Minami-Ku, Hiroshima Japan
| | - Tomo Takegawa
- Department of Synthetic Organic Chemistry; Institute of Biomedical & Health Science; Hiroshima University; 1-2-3 Kasumi 734-8553 Minami-Ku, Hiroshima Japan
| | - Yuri Kotomori
- Department of Synthetic Organic Chemistry; Institute of Biomedical & Health Science; Hiroshima University; 1-2-3 Kasumi 734-8553 Minami-Ku, Hiroshima Japan
| | - Yuko Otani
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo 113-0033 Bunkyo-Ku, Tokyo Japan
| | - Tomohiko Ohwada
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo 113-0033 Bunkyo-Ku, Tokyo Japan
| | - Kei Takeda
- Department of Synthetic Organic Chemistry; Institute of Biomedical & Health Science; Hiroshima University; 1-2-3 Kasumi 734-8553 Minami-Ku, Hiroshima Japan
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7
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Yang X, Nath D, Gau MR, Steward OW, Fleming FF. Sulfone–Metal Exchange and Alkylation of Sulfonylnitriles. Angew Chem Int Ed Engl 2017; 56:7257-7260. [DOI: 10.1002/anie.201704028] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Xun Yang
- Department of Chemistry Drexel University 32 South 32nd St. Philadelphia PA 19104 USA
| | - Dinesh Nath
- Department of Chemistry University of Oklahoma Norman OK 73019 USA
| | - Michael R. Gau
- Department of Chemistry Temple University 420 Beury Hall, 1901 N. 13th St. Philadelphia PA 19122 USA
| | - Omar W. Steward
- Department of Chemistry Duquesne University Pittsburgh PA 15282 USA
| | - Fraser F. Fleming
- Department of Chemistry Drexel University 32 South 32nd St. Philadelphia PA 19104 USA
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8
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9
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Yang X, Nath D, Morse J, Ogle C, Yurtoglu E, Altundas R, Fleming F. Cyclic Alkenenitriles: Copper-Catalyzed Deconjugative α-Alkylation. J Org Chem 2016; 81:4098-102. [DOI: 10.1021/acs.joc.6b00367] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xun Yang
- Department
of Chemistry, Duquesne University, Pittsburgh, Pennsylvania 15282, United States
| | - Dinesh Nath
- Department
of Chemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Jared Morse
- Department
of Chemistry, The University of North Carolina at Charlotte, Charlotte, North Carolina 28223, United States
| | - Craig Ogle
- Department
of Chemistry, The University of North Carolina at Charlotte, Charlotte, North Carolina 28223, United States
| | - Emine Yurtoglu
- Department
of Chemistry, Ataturk University, 25240 Erzurum, Turkey
| | - Ramazan Altundas
- Department
of Chemistry, Ataturk University, 25240 Erzurum, Turkey
| | - Fraser Fleming
- Department
of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104, United States
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10
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Lin S, Kumagai N, Shibasaki M. Enantioselective synthesis of α,α-disubstituted α-amino acids via direct catalytic asymmetric addition of acetonitrile to α-iminoesters. Org Biomol Chem 2016; 14:9725-9730. [DOI: 10.1039/c6ob01874b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chiral N-heterocyclic carbene complexes of [Ir(cod)(OMe)]2 in combination with Barton's base enabled direct enantioselective addition of acetonitrile to α-iminoesters.
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Affiliation(s)
- Shaoquan Lin
- Institute of Microbial Chemistry (BIKAKEN)
- Tokyo
- Tokyo 141-0021
- Japan
| | - Naoya Kumagai
- Institute of Microbial Chemistry (BIKAKEN)
- Tokyo
- Tokyo 141-0021
- Japan
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11
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Kotomori Y, Sasaki M, Kawahata M, Yamaguchi K, Takeda K. Stereochemical Course of Deprotonation-Acylation of N-Boc- and N-Carbamoyl-2-cyano-6-methylpiperidines. J Org Chem 2015; 80:11013-20. [PMID: 26457453 DOI: 10.1021/acs.joc.5b02178] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stereochemical course of electrophilic substitution of α-nitrile metallocarbanions generated by deprotonation from N-Boc- and N-carbamoyl-2-cyano-6-methylpiperidines was investigated. Deprotonation in the presence of an electrophile taking advantage of the high acidity of α-nitrile protons allowed examination of the effects of a chelating group on the nitrogen atom, a countercation, and the reactivity of an electrophile on the steric course. Analyses of reactions using aroyl chlorides and methyl iodide revealed the following: (1) the substitution reactions basically proceed with retention of configuration, (2) the extent of an inversion product increases with decreasing chelating ability of the N-substituent and with increasing leaving ability (ionic character) of a countercation (Li, Na, K) of the anionic species, and (3) the use of a more reactive electrophile results in an increase of the retention product.
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Affiliation(s)
- Yuri Kotomori
- Department of Synthetic Organic Chemistry, Institute of Biomedical & Health Sciences, Hiroshima University , 1-2-3 Kasumi, Minami-Ku, Hiroshima 734-8553, Japan
| | - Michiko Sasaki
- Department of Synthetic Organic Chemistry, Institute of Biomedical & Health Sciences, Hiroshima University , 1-2-3 Kasumi, Minami-Ku, Hiroshima 734-8553, Japan
| | - Masatoshi Kawahata
- Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University , 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan
| | - Kentaro Yamaguchi
- Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University , 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan
| | - Kei Takeda
- Department of Synthetic Organic Chemistry, Institute of Biomedical & Health Sciences, Hiroshima University , 1-2-3 Kasumi, Minami-Ku, Hiroshima 734-8553, Japan
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12
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Feldman KS, Gonzalez IY, Glinkerman CM. Indolidenes and Indolidenium Intermediates in the Synthesis of Cyclopent[b]indoles: Mechanistic Studies on Intramolecular Cyclizations. J Org Chem 2015; 80:11849-62. [DOI: 10.1021/acs.joc.5b01777] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ken S. Feldman
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Inanllely Y. Gonzalez
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Christopher M. Glinkerman
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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13
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Lu P, Pakkala VS, Evanseck JD, Fleming FF. Metalated nitriles: S Ni' cyclizations with a propargylic electrophile. Tetrahedron Lett 2015; 56:3216-3219. [PMID: 26120212 PMCID: PMC4480775 DOI: 10.1016/j.tetlet.2015.01.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
A rare 5-exo-dig SNi' cyclization with magnesiated and lithiated nitriles affords a cis-fused hydrindane bearing an exocyclic allene. The cyclization of the dilithiated nitrile pits a stereoelectronic preference for a trans-hydrindane against a cyclization through a less strained transition structure to the corresponding cis-hydrindane. Computational modeling suggests that the dilithiated nitrile cyclizes to a cis-hydrindane because the preferred transition structure positions the lithium cation in a cone of electron density that bridges the nitrile-bearing carbon, an alkoxide, and an electron-rich alkyne functionality.
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Affiliation(s)
- Ping Lu
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, PA 15282-1530, USA
| | - Venkata S. Pakkala
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, PA 15282-1530, USA
| | - Jeffrey D. Evanseck
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, PA 15282-1530, USA
| | - Fraser F. Fleming
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, PA 15282-1530, USA
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14
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Sureshkumar D, Ganesh V, Kumagai N, Shibasaki M. Direct Catalytic Addition of Alkylnitriles to Aldehydes by Transition-Metal/NHC Complexes. Chemistry 2014; 20:15723-6. [DOI: 10.1002/chem.201404808] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Indexed: 11/06/2022]
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15
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Kim J, Kim H, Kim N, Yu CM. Regulation of diastereoselectivity in the carbocyclization of allenyl (S)-N-tert-butylsulfinimines through a three-component assembly. J Org Chem 2014; 79:1040-6. [PMID: 24428493 DOI: 10.1021/jo4025072] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Allenyl sulfinimines can be stereoselectively cyclized with hexamethylditin under palladium catalysis conditions followed by a selection of additives for an activated transmetalation. Reactivity and diastereoselectivity for the cyclization strongly depend on the characteristics of additives. A highly diastereoselective synthesis of five-membered rings is achieved from the reaction of the corresponding allenyl (S)-N-tert-butylsulfinimies through the following sequence. After the distannylation of the allenyl group with hexamethylditin catalyzed by the Pd complex, stereochemical routes are additive dependent: addition of SnCl4 affords a cis ring exclusively, whereas a trans ring is formed predominantly by the introduction of B-bromocatecholborane. Extension of the methodology to the synthesis of six-membered cis rings is achieved by using B-bromocatecholborane. Stereochemical relationships of products were unambiguously deduced by X-ray crystallography.
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16
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Lujan-Montelongo JA, Lu P, Liu W, Fleming FF. Metalated nitriles: S(N)i and S(N)i' installation of contiguous quaternary-tertiary and quaternary-quaternary centers. Chemistry 2013; 19:8746-50. [PMID: 23686860 PMCID: PMC3826919 DOI: 10.1002/chem.201301046] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Indexed: 11/11/2022]
Affiliation(s)
| | - Ping Lu
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, PA 15282-1530 (USA)
| | - Wang Liu
- Chemical Abstracts Service, 2540 Olentangy River Road, Columbus, OH 43202 (USA)
| | - Fraser F. Fleming
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, PA 15282-1530 (USA)
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17
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Barker G, Alshawish MR, Skilbeck MC, Coldham I. Remarkable Configurational Stability of Magnesiated Nitriles. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201303442] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Barker G, Alshawish MR, Skilbeck MC, Coldham I. Remarkable Configurational Stability of Magnesiated Nitriles. Angew Chem Int Ed Engl 2013; 52:7700-3. [DOI: 10.1002/anie.201303442] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Indexed: 11/08/2022]
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19
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Chakraborty S, Patel YJ, Krause JA, Guan H. A Robust Nickel Catalyst for Cyanomethylation of Aldehydes: Activation of Acetonitrile under Base-Free Conditions. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201302613] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Chakraborty S, Patel YJ, Krause JA, Guan H. A Robust Nickel Catalyst for Cyanomethylation of Aldehydes: Activation of Acetonitrile under Base-Free Conditions. Angew Chem Int Ed Engl 2013; 52:7523-6. [DOI: 10.1002/anie.201302613] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Indexed: 11/08/2022]
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21
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Purzycki M, Liu W, Hilmersson G, Fleming FF. Metalated nitriles: N- and C-coordination preferences of Li, Mg, and Cu cations. Chem Commun (Camb) 2013; 49:4700-2. [DOI: 10.1039/c3cc41703d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Kim MJ, Sohn TI, Kim D, Paton RS. Concise Substrate-Controlled Asymmetric Total Syntheses of Dioxabicyclic Marine Natural Products with 2,10-Dioxabicyclo-[7.3.0]dodecene and 2,9-Dioxabicyclo[6.3.0]undecene Skeletons. J Am Chem Soc 2012. [DOI: 10.1021/ja310249u] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mi Jung Kim
- The Research Institute of Pharmaceutical
Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Te-ik Sohn
- The Research Institute of Pharmaceutical
Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Deukjoon Kim
- The Research Institute of Pharmaceutical
Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Robert S. Paton
- Chemistry Research Laboratory,
Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
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23
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Vyas Devambatla RK, Velagaleti R, Yarravarapu N, Fleming FF. SNi′ displacements with main group organometallics. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.02.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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24
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Defaut B, Parsons TB, Spencer N, Male L, Kariuki BM, Grainger RS. Synthesis of the trans-hydrindane core of dictyoxetane. Org Biomol Chem 2012; 10:4926-32. [DOI: 10.1039/c2ob25384d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Abstract
The so-called Deslongchamps annulation of deprotonated γ,δ-unsaturated β-ketoesters 15 to 2-(alkoxycarbonyl)cyclohex-2-en-1-ones or similarly activated cyclohex-2-en-1-ones offers a versatile access to various kinds of decalindiones. The scope of Deslongchamps annulations was extended by establishing acceptor-substituted benzoquinone monoketals such as 13 as viable substrates. They gave octalindiones such as 35 with diastereoselectivities ≥ 95:5.
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Affiliation(s)
- Denis Petrović
- Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität, Albertstr. 21, 79104 Freiburg im Breisgau, Germany
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Ouizem S, Cheramy S, Botuha C, Chemla F, Ferreira F, Pérez‐Luna A. Cyclization of Zincated α‐
N
‐Homoallylamino Nitriles: A New Entry to Enantiopure 2,3‐Methanopyrrolidines. Chemistry 2010; 16:12668-77. [DOI: 10.1002/chem.201001639] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sabrina Ouizem
- UPMC Univ Paris 06, UMR CNRS 7201, Institut Parisien de Chimie Moléculaire, Institut de Chimie Moléculaire (FR 2769), Case 183, 4 place Jussieu, 75005 Paris (France), Fax: (+33) 144‐27‐75‐67
| | - Sandrine Cheramy
- UPMC Univ Paris 06, UMR CNRS 7201, Institut Parisien de Chimie Moléculaire, Institut de Chimie Moléculaire (FR 2769), Case 183, 4 place Jussieu, 75005 Paris (France), Fax: (+33) 144‐27‐75‐67
| | - Candice Botuha
- UPMC Univ Paris 06, UMR CNRS 7201, Institut Parisien de Chimie Moléculaire, Institut de Chimie Moléculaire (FR 2769), Case 183, 4 place Jussieu, 75005 Paris (France), Fax: (+33) 144‐27‐75‐67
| | - Fabrice Chemla
- UPMC Univ Paris 06, UMR CNRS 7201, Institut Parisien de Chimie Moléculaire, Institut de Chimie Moléculaire (FR 2769), Case 183, 4 place Jussieu, 75005 Paris (France), Fax: (+33) 144‐27‐75‐67
| | - Franck Ferreira
- UPMC Univ Paris 06, UMR CNRS 7201, Institut Parisien de Chimie Moléculaire, Institut de Chimie Moléculaire (FR 2769), Case 183, 4 place Jussieu, 75005 Paris (France), Fax: (+33) 144‐27‐75‐67
| | - Alejandro Pérez‐Luna
- UPMC Univ Paris 06, UMR CNRS 7201, Institut Parisien de Chimie Moléculaire, Institut de Chimie Moléculaire (FR 2769), Case 183, 4 place Jussieu, 75005 Paris (France), Fax: (+33) 144‐27‐75‐67
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Perry MA, Morin MD, Slafer BW, Wolckenhauer SA, Rychnovsky SD. Fully substituted carbon centers by diastereoselective spirocyclization: stereoselective synthesis of (+)-lepadiformine C. J Am Chem Soc 2010; 132:9591-3. [PMID: 20578697 PMCID: PMC2912418 DOI: 10.1021/ja104250b] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reductive lithiation of N-Boc alpha-amino nitriles generated alpha-amino alkyllithium reagents with unexpected selectivity. The intermediate radical prefers to align with the nitrogen lone pair, and this interaction leads to an A(1,3)-strain effect that biases the conformation of the radical. In cyclohexane rings with alpha-substituents the net effect is an inversion of configuration on reductive lithiation. In the presence of a tethered electrophile the alkyllithium cyclizes to produce a spiro compound, again with inversion of configuration. The overall result is retention of configuration in the cyclization reaction. The same overall selectivity is found with alpha-oxygen alkyllithium cyclizations, but in this case both steps proceed with retention. The difference can be explained by careful consideration of the intermediate geometries. The alpha-amino spirocyclization was utilized in a concise and stereoselective synthesis of lepadiformine C.
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Affiliation(s)
- Matthew A. Perry
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, California 92697-2025
| | - Matthew D. Morin
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, California 92697-2025
| | - Brian W. Slafer
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, California 92697-2025
| | - Scott A. Wolckenhauer
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, California 92697-2025
| | - Scott D. Rychnovsky
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, California 92697-2025
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Fleming FF, Wei G. Cyclohexanecarbonitriles: assigning configurations at quaternary centers from (13)C NMR CN chemical shifts. J Org Chem 2009; 74:3551-3. [PMID: 19348434 PMCID: PMC2692050 DOI: 10.1021/jo900286f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
(13)C NMR chemical shifts of the nitrile carbon in cyclohexanecarbonitriles directly correlate with the configuration of the quaternary, nitrile-bearing stereocenter. Comparing (13)C NMR chemical shifts for over 200 cyclohexanecarbonitriles reveals that equatorially oriented nitriles resonate 3.3 ppm downfield, on average, from their axial counterparts. Pairs of axial/equatorial diastereomers varying only at the nitrile-bearing carbon consistently exhibit downfield shifts of delta 0.4-7.2 for the equatorial nitrile carbon, even in angularly substituted decalins and hydrindanes.
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Affiliation(s)
- Fraser F. Fleming
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh PA, 15282-1530, USA.
| | - Guoqing Wei
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh PA, 15282-1530, USA.
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Kaumanns O, Appel R, Lemek T, Seeliger F, Mayr H. Nucleophilicities of the Anions of Arylacetonitriles and Arylpropionitriles in Dimethyl Sulfoxide. J Org Chem 2008; 74:75-81. [DOI: 10.1021/jo802241x] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Oliver Kaumanns
- Department Chemie und Biochemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13 (Haus F), 81377 München, Germany
| | - Roland Appel
- Department Chemie und Biochemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13 (Haus F), 81377 München, Germany
| | - Tadeusz Lemek
- Department Chemie und Biochemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13 (Haus F), 81377 München, Germany
| | - Florian Seeliger
- Department Chemie und Biochemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13 (Haus F), 81377 München, Germany
| | - Herbert Mayr
- Department Chemie und Biochemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13 (Haus F), 81377 München, Germany
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