1
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Abell J, Bold CP, Vicens L, Jentsch T, Velasco N, Tyler JL, Straker RN, Noble A, Aggarwal VK. Synthesis of Dihydropyridine Spirocycles by Semi-Pinacol-Driven Dearomatization of Pyridines. Org Lett 2023; 25:400-404. [PMID: 36626565 PMCID: PMC9872164 DOI: 10.1021/acs.orglett.2c04095] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The identification of the beneficial pharmacokinetic properties of aza-spirocycles has led to the routine incorporation of these highly rigid and three-dimensional structures in pharmaceuticals. Herein, we report an operationally simple synthesis of spirocyclic dihydropyridines via an electrophile-induced dearomative semi-pinacol rearrangement of 4-(1'-hydroxycyclobutyl)pyridines. The various points for diversification of the spirocyclization precursors, as well as the synthetic utility of the amine and ketone functionalities in the products, provide the potential to rapidly assemble medicinally relevant spirocycles.
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Affiliation(s)
- Joseph
C. Abell
- School
of Chemistry, University of Bristol, Cantock’s Close, BristolBS8 1TS, U.K.
| | - Christian P. Bold
- School
of Chemistry, University of Bristol, Cantock’s Close, BristolBS8 1TS, U.K.
| | - Laia Vicens
- School
of Chemistry, University of Bristol, Cantock’s Close, BristolBS8 1TS, U.K.
| | - Tom Jentsch
- School
of Chemistry, University of Bristol, Cantock’s Close, BristolBS8 1TS, U.K.
| | - Noelia Velasco
- School
of Chemistry, University of Bristol, Cantock’s Close, BristolBS8 1TS, U.K.
| | - Jasper L. Tyler
- School
of Chemistry, University of Bristol, Cantock’s Close, BristolBS8 1TS, U.K.
| | | | - Adam Noble
- School
of Chemistry, University of Bristol, Cantock’s Close, BristolBS8 1TS, U.K.
| | - Varinder K. Aggarwal
- School
of Chemistry, University of Bristol, Cantock’s Close, BristolBS8 1TS, U.K.,
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2
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McDonald TR, Mills LR, West MS, Rousseaux SAL. Selective Carbon–Carbon Bond Cleavage of Cyclopropanols. Chem Rev 2020; 121:3-79. [DOI: 10.1021/acs.chemrev.0c00346] [Citation(s) in RCA: 99] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Tyler R. McDonald
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
| | - L. Reginald Mills
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
| | - Michael S. West
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
| | - Sophie A. L. Rousseaux
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada
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3
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Rivera RM, Jang Y, Poteat CM, Lindsay VNG. General Synthesis of Cyclopropanols via Organometallic Addition to 1-Sulfonylcyclopropanols as Cyclopropanone Precursors. Org Lett 2020; 22:6510-6515. [PMID: 32806174 DOI: 10.1021/acs.orglett.0c02303] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The addition of organometallic reagents to ketones constitutes one of the most straightforward synthetic approaches to tertiary alcohols. However, due to the absence of a well-behaved class of cyclopropanone surrogates accessible in enantioenriched form, such a trivial synthetic disconnection has received very little attention in the literature for the formation of tertiary cyclopropanols. In this work, we report a simple and high-yielding synthesis of 1-substituted cyclopropanols via the addition of diverse organometallic reagents to 1-phenylsulfonylcyclopropanols, acting here as in situ precursors of the corresponding cyclopropanones. The transformation is shown to be amenable to sp-, sp2-, or sp3-hybridized organometallic C-nucleophiles under mild conditions, and the use of enantioenriched substrates led to highly diastereoselective additions and the formation of optically active cyclopropanols.
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Affiliation(s)
- Roger Machín Rivera
- Department of Chemistry, North Carolina State University, 2620 Yarbrough Drive, Raleigh, North Carolina 27695, United States
| | - Yujin Jang
- Department of Chemistry, North Carolina State University, 2620 Yarbrough Drive, Raleigh, North Carolina 27695, United States
| | - Christopher M Poteat
- Department of Chemistry, North Carolina State University, 2620 Yarbrough Drive, Raleigh, North Carolina 27695, United States
| | - Vincent N G Lindsay
- Department of Chemistry, North Carolina State University, 2620 Yarbrough Drive, Raleigh, North Carolina 27695, United States
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4
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Wu JL, Chiou WH. Diastereocontrolled Formal Syntheses of (±)-Lepadiformines A, B, and C and the Divergent Synthesis of 2- epi-Lepadiformine C through Unexpected Double Consecutive Epimerizations. J Org Chem 2020; 85:9051-9063. [PMID: 32580551 DOI: 10.1021/acs.joc.0c00964] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
We describe here the diastereocontrolled formal racemic syntheses of tricyclic marine alkaloids, lepadiformines A, B, and C as well as their C2 epimers, featuring divergent and stereoselective syntheses of the N-acetyl-8a-cyanodecahydroquinoline frameworks and the base-mediated intramolecular cyclization to establish the spiral quaternary center of the tricyclic framework from sterically well-defined α-aminonitrile 2. The approach allows us to accomplish the tricyclic core structure efficiently from readily available starting materials through simple operations. An unexpected pair of consecutive epimerizations at two contiguous stereocenters is observed on the basis of single-crystal X-ray analyses of the intermediates and derivatives. The findings have been successfully applied to the total synthesis of 2-epi-lepadiformine C. The epimerization mechanism has been elucidated through a series of deuterium-labelling-controlled experiments.
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Affiliation(s)
- Jui-Lin Wu
- Department of Chemistry, National Chung-Hsing University, Taichung 402, Taiwan, R.O.C
| | - Wen-Hua Chiou
- Department of Chemistry, National Chung-Hsing University, Taichung 402, Taiwan, R.O.C
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5
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Bonjoch J, Diaba F. Radical Reactions in Alkaloid Synthesis: A Perspective from Carbon Radical Precursors. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000391] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Josep Bonjoch
- Laboratori de Química Orgànica Facultat de Farmàcia, IBUB Universitat de Barcelona Av. Joan XXIII s/n 08028 Barcelona Spain
| | - Faiza Diaba
- Laboratori de Química Orgànica Facultat de Farmàcia, IBUB Universitat de Barcelona Av. Joan XXIII s/n 08028 Barcelona Spain
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6
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Shimomura M, Sato M, Azuma H, Sakata J, Tokuyama H. Total Synthesis of (-)-Lepadiformine A via Radical Translocation-Cyclization Reaction. Org Lett 2020; 22:3313-3317. [PMID: 32182082 DOI: 10.1021/acs.orglett.0c00474] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Total synthesis of (-)-lepadiformine A featuring construction of the 1-azaspiro[4.5]decane skeleton by a highly diastereoselective radical translocation-cyclization reaction of a γ-lactam derivative bearing a chiral butenolide moiety is described. The enantioselective construction of butenolide is conducted via Krische's catalytic asymmetric allylation protocol. After the radical translocation-cyclization reaction, a hydroxymethyl group at the C-13 position was stereoselectively introduced by a one-pot partial reduction-allylation protocol of the unprotected lactam derivative. Finally, the total synthesis is completed by formation of a C ring.
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Affiliation(s)
- Masashi Shimomura
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Manabu Sato
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Hiroki Azuma
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Juri Sakata
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Hidetoshi Tokuyama
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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7
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Kaur N, Verma Y, Grewal P, Bhardwaj P, Devi M. Application of titanium catalysts for the syntheses of heterocycles. SYNTHETIC COMMUN 2019. [DOI: 10.1080/00397911.2019.1606922] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Navjeet Kaur
- Department of Chemistry, Banasthali Vidyapith, Banasthali, India
| | - Yamini Verma
- Department of Chemistry, Banasthali Vidyapith, Banasthali, India
| | - Pooja Grewal
- Department of Chemistry, Banasthali Vidyapith, Banasthali, India
| | - Pranshu Bhardwaj
- Department of Chemistry, Banasthali Vidyapith, Banasthali, India
| | - Meenu Devi
- Department of Chemistry, Banasthali Vidyapith, Banasthali, India
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8
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Takashima K, Hayakawa D, Gouda H, Toyooka N. Formal Syntheses of (−)-Lepadiformines A, C, and (−)-Fasicularin. J Org Chem 2019; 84:5222-5229. [DOI: 10.1021/acs.joc.9b00071] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Hiroaki Gouda
- School of Pharmacy, Showa University, Tokyo 142-8555, Japan
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9
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10
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Zhang XM, Tu YQ, Zhang FM, Chen ZH, Wang SH. Recent applications of the 1,2-carbon atom migration strategy in complex natural product total synthesis. Chem Soc Rev 2018; 46:2272-2305. [PMID: 28349159 DOI: 10.1039/c6cs00935b] [Citation(s) in RCA: 119] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
1,2-Carbon atom rearrangement has been broadly applied as a guiding strategy in complex molecule assembly. As it entails the carbon-carbon or carbon-heteroatom bond migration between two vicinal atoms, this type of reaction is capable of generating structural complexity through a molecular skeletal reorganization. This review will focus on recent employment of this strategy in the total synthesis of natural products, highlighting the exceptional utility of such synthetic methodologies in the construction of intricate carbocycles, heterocycles or structurally complex motifs from synthetically more accessible precursors.
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Affiliation(s)
- Xiao-Ming Zhang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China.
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11
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Shim SY, Choi Y, Ryu DH. Asymmetric Synthesis of Cyclobutanone via Lewis Acid Catalyzed Tandem Cyclopropanation/Semipinacol Rearrangement. J Am Chem Soc 2018; 140:11184-11188. [PMID: 30089355 DOI: 10.1021/jacs.8b06835] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Chiral Lewis acid catalyzed asymmetric formation of cyclobutanones from α-silyloxyacroleins and α-alkyl or α-aryl diazoesters has been developed. In the presence of a chiral oxazaborolidinium ion catalyst, various α-silyloxycyclobutanones possessing a chiral β-quaternary center were synthesized in high yield (up to 91%) with excellent enantio- and diastereoselectivity (up to 98% ee and up to >20:1 dr) through tandem cyclopropanation/semipinacol rearrangement. The synthetic potential of this method was illustrated by conversion of the product to various cyclic compounds such as γ-lactone, cyclobutanol, and cyclopentanone.
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Affiliation(s)
- Su Yong Shim
- Department of Chemistry , Sungkyunkwan University , Suwon 16419 , Korea
| | - Yuna Choi
- Department of Chemistry , Sungkyunkwan University , Suwon 16419 , Korea
| | - Do Hyun Ryu
- Department of Chemistry , Sungkyunkwan University , Suwon 16419 , Korea.,School of Chemistry and Chemical Engineering , University of Jinan , Jinan 250022 , China
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12
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Kaur N, Jangid NK, Sharma V. Metal- and nonmetal-catalyzed synthesis of five-membered S,N-heterocycles. J Sulphur Chem 2017. [DOI: 10.1080/17415993.2017.1415338] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Navjeet Kaur
- Department of Chemistry, Banasthali University, Banasthali, India
| | | | - Vivek Sharma
- Department of Chemistry, Banasthali University, Banasthali, India
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13
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Thigulla Y, Ranga S, Ghosal S, Subbalakshmi J, Bhattacharya A. One-Pot Two Step Nazarov-Schmidt Rearrangement for the Synthesis of Fused δ-Lactam Systems. ChemistrySelect 2017. [DOI: 10.1002/slct.201701848] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yadagiri Thigulla
- Department of Chemistry; Birla Institute of Technology and Science-Pilani (Hyderabad Campus); Hyderabad- 500078 India
| | - Santosh Ranga
- Department of Chemistry; Birla Institute of Technology and Science-Pilani (Hyderabad Campus); Hyderabad- 500078 India
| | - Subhas Ghosal
- Department of Chemistry; Birla Institute of Technology and Science-Pilani (Hyderabad Campus); Hyderabad- 500078 India
| | - Jayanty Subbalakshmi
- Department of Chemistry; Birla Institute of Technology and Science-Pilani (Hyderabad Campus); Hyderabad- 500078 India
| | - Anupam Bhattacharya
- Department of Chemistry; Birla Institute of Technology and Science-Pilani (Hyderabad Campus); Hyderabad- 500078 India
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14
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Burnley J, Wang ZJ, Jackson WR, Robinson AJ. Cross-Metathesis Approach to the Tricyclic Marine Alkaloids (−)-Fasicularin and (−)-Lepadiformine A. J Org Chem 2017; 82:8497-8505. [DOI: 10.1021/acs.joc.7b01135] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James Burnley
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Zhen J. Wang
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - W. Roy Jackson
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Andrea J. Robinson
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
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15
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Nishikawa K, Yamauchi K, Kikuchi S, Ezaki S, Koyama T, Nokubo H, Matsumura K, Kodama T, Kumagai M, Morimoto Y. Total Syntheses of Lepadiformine Marine Alkaloids with Enantiodivergency, Utilizing Hg(OTf)
2
‐Catalyzed Cycloisomerization Reaction and their Cytotoxic Activities. Chemistry 2017; 23:9535-9545. [DOI: 10.1002/chem.201701475] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Keisuke Nishikawa
- Department of Chemistry, Graduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558–8585 Japan
| | - Kengo Yamauchi
- Department of Chemistry, Graduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558–8585 Japan
| | - Seiho Kikuchi
- Department of Chemistry, Graduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558–8585 Japan
| | - Shinnosuke Ezaki
- Department of Chemistry, Graduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558–8585 Japan
| | - Tomoyuki Koyama
- Department of Chemistry, Graduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558–8585 Japan
| | - Haruka Nokubo
- Department of Chemistry, Graduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558–8585 Japan
| | - Kunihiro Matsumura
- Department of Chemistry, Graduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558–8585 Japan
| | - Takeshi Kodama
- Department of Chemistry, Graduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558–8585 Japan
| | - Momochika Kumagai
- Department of Chemistry, Graduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558–8585 Japan
- Japan Food Research Laboratories Ibaraki-shi Osaka 567-0085 Japan
| | - Yoshiki Morimoto
- Department of Chemistry, Graduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558–8585 Japan
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16
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Lee S, Bae M, In J, Kim JH, Kim S. Asymmetric Total Synthesis of Lepadiformine C Using Memory of Chirality in an Intramolecular Ester Enolate Michael Addition. Org Lett 2016; 19:254-257. [DOI: 10.1021/acs.orglett.6b03550] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Seokwoo Lee
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Minsik Bae
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Jinkyung In
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Jae Hyun Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Sanghee Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
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17
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Tsukanov SV, Marks LR, Comins DL. Studies toward the Synthesis of Lepadiformine A. J Org Chem 2016; 81:10433-10443. [PMID: 27626463 DOI: 10.1021/acs.joc.6b01514] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein is described an original approach to access a tricyclic framework of the lepadiformine-type alkaloids. A Grignard/N-acylpyridinium salt reaction of a 4-methoxytetrahydroquinoline is the key carbon-carbon bond-forming step that was used to establish the desired absolute stereochemistry at the C2 position of the target alkaloid. The synthesis features an allylation reaction with an N-acyliminium ion to set the C10 quaternary stereocenter, a mild dissolving-metal cleavage of hindered phenyl carbamates, and an aminoiodocyclization to form the pyrrolidine ring. While this route does not provide the correct C10 stereochemistry, it showcases an efficient method to build analogues with the ring system of this class of alkaloids in 11 steps overall.
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Affiliation(s)
- Sergey V Tsukanov
- Department of Chemistry, North Carolina State University , Raleigh, North Carolina 27695-8204, United States
| | - Lucas R Marks
- Department of Chemistry, North Carolina State University , Raleigh, North Carolina 27695-8204, United States
| | - Daniel L Comins
- Department of Chemistry, North Carolina State University , Raleigh, North Carolina 27695-8204, United States
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18
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Abstract
The synthesis of a tricyclic marine alkaloid, fasicularin, was accomplished. Stereoselective synthesis of the aza-spirocyclic BC-ring precursor and ensuing construction of the A-ring with stereocontrolled installation of the C2 hexyl group feature prominently in the synthesis.
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Affiliation(s)
- Atsushi Kaga
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore
| | - Ya Lin Tnay
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore
| | - Shunsuke Chiba
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore
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19
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Mailyan AK, Eickhoff JA, Minakova AS, Gu Z, Lu P, Zakarian A. Cutting-Edge and Time-Honored Strategies for Stereoselective Construction of C–N Bonds in Total Synthesis. Chem Rev 2016; 116:4441-557. [DOI: 10.1021/acs.chemrev.5b00712] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Artur K. Mailyan
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - John A. Eickhoff
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Anastasiia S. Minakova
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Zhenhua Gu
- Department
of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Ping Lu
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Armen Zakarian
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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20
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Abstract
Dissection of lepadiformine by a double hydroamination transform affords a simple achiral amino diene. This reaction is accomplished in the forward sense by amine-directed hydroboration and an oxidative alkyl shift to nitrogen, both of which occur with high stereoselectivity to generate three stereogenic centers and the lepadiformine skeleton.
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Affiliation(s)
- M Greg Tabor
- Department of Chemistry, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Ryan A Shenvi
- Department of Chemistry, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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21
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Nishikawa K, Kikuchi S, Ezaki S, Koyama T, Nokubo H, Kodama T, Tachi Y, Morimoto Y. Total Synthesis of (−)-Lepadiformine A Utilizing Hg(OTf)2-Catalyzed Cycloisomerization Reaction. Org Lett 2015; 17:5772-5. [DOI: 10.1021/acs.orglett.5b02867] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Keisuke Nishikawa
- Department of Chemistry,
Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Seiho Kikuchi
- Department of Chemistry,
Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Shinnosuke Ezaki
- Department of Chemistry,
Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Tomoyuki Koyama
- Department of Chemistry,
Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Haruka Nokubo
- Department of Chemistry,
Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Takeshi Kodama
- Department of Chemistry,
Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Yoshimitsu Tachi
- Department of Chemistry,
Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Yoshiki Morimoto
- Department of Chemistry,
Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
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22
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Shinde MV, Ople RS, Sangtani E, Gonnade R, Reddy DS. Synthesis of novel N-cyclopentenyl-lactams using the Aubé reaction. Beilstein J Org Chem 2015. [PMID: 26199661 PMCID: PMC4505090 DOI: 10.3762/bjoc.11.119] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
A novel and convenient method utilizing the Aubé reaction to access a new class of compounds that are similar to carbocyclic nucleosides is reported. The azido alcohol derived from Vince lactam undergoes the Aubé reaction with various cyclic ketones to give cyclopentenyl-substituted lactams. Upon dihydroxylation, this affords the N-cyclopentenyl-lactam compounds in racemic form. Given the numerous uses of nucleosides and related compounds, we were interested in the synthesis of carbocylic nucleoside mimics. The attempts and results are described herein.
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Affiliation(s)
- Madhuri V Shinde
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
| | - Rohini S Ople
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
| | - Ekta Sangtani
- Center for Material Characterization, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
| | - Rajesh Gonnade
- Center for Material Characterization, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
| | - D Srinivasa Reddy
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
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23
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Temperature dependence of turnover in a Sc(OTf) 3-catalyzed intramolecular Schmidt reaction. Tetrahedron Lett 2015; 56:3137-3140. [PMID: 26085693 DOI: 10.1016/j.tetlet.2014.12.068] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The intramolecular Schmidt reaction of ketones and tethered azides is an efficient method for the generation of amides and lactams. This reaction is catalyzed by Lewis acids, which tightly bind the strongly basic amide product and result in product inhibition. We report herein conditions to achieve a catalytic Schmidt reaction using substoichiometric amounts of the heat-stable Lewis acid Sc(OTf)3. This species was shown to effectively release products of the Schmidt reaction in a temperature-dependent fashion. Thus, heat was able to promote catalyst turnover. A brief substrate scope was conducted using these conditions.
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24
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In J, Lee S, Kwon Y, Kim S. Divergent Total Synthesis of the Tricyclic Marine Alkaloids Lepadiformine, Fasicularin, and Isomers of Polycitorols by Reagent-Controlled Diastereoselective Reductive Amination. Chemistry 2014; 20:17433-42. [DOI: 10.1002/chem.201404316] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Indexed: 11/12/2022]
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25
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Kim C, Kang S, Rhee YH. Synthesis of the Tricyclic Core in Stemonamine Alkaloids via One-Pot Gold(I)-Catalyzed Cyclization and Schmidt Rearrangement: Formal Synthesis of (±)-Stemonamine. J Org Chem 2014; 79:11119-24. [DOI: 10.1021/jo502103p] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cheoljae Kim
- Department of Chemistry, POSTECH, 77 Cheongam-Ro,
Nam-Gu, Pohang, Kyungbuk, Republic of Korea, 790-784
| | - Soyeong Kang
- Department of Chemistry, POSTECH, 77 Cheongam-Ro,
Nam-Gu, Pohang, Kyungbuk, Republic of Korea, 790-784
| | - Young Ho Rhee
- Department of Chemistry, POSTECH, 77 Cheongam-Ro,
Nam-Gu, Pohang, Kyungbuk, Republic of Korea, 790-784
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26
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Fesenko AA, Shutalev AD. A novel access to pyrido[4,3-d]pyrimidine scaffold via Staudinger/intramolecular aza-Wittig reaction of 5-acyl-4-(β-azidoalkyl)-1,2,3,4-tetrahydropyrimidin-2-ones. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.06.128] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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27
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Carreira EM, Fessard TC. Four-Membered Ring-Containing Spirocycles: Synthetic Strategies and Opportunities. Chem Rev 2014; 114:8257-322. [DOI: 10.1021/cr500127b] [Citation(s) in RCA: 364] [Impact Index Per Article: 36.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Erick M. Carreira
- Laboratorium für Organische Chemie, and ‡SpiroChem AG, ETH-Zürich, Vladimir-Prelog-Weg
3, 8093 Zürich, Switzerland
| | - Thomas C. Fessard
- Laboratorium für Organische Chemie, and ‡SpiroChem AG, ETH-Zürich, Vladimir-Prelog-Weg
3, 8093 Zürich, Switzerland
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28
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Köhler née Adrien A, Raabe G, Runsink J, Köhler F, Gais HJ. Sulfoximine-Based Modular Enantioselective Synthesis of Azaspirocycles Featuring Sulfoximine Displacement, Dianion Cycloalkylation, RCM andN-Acyliminium Ion Formation. European J Org Chem 2014. [DOI: 10.1002/ejoc.201400068] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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29
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McLeod MC, Singh G, Plampin JN, Rane D, Wang JL, Day VW, Aubé J. Probing chemical space with alkaloid-inspired libraries. Nat Chem 2014; 6:133-40. [PMID: 24451589 PMCID: PMC4024831 DOI: 10.1038/nchem.1844] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 12/05/2013] [Indexed: 01/03/2023]
Abstract
Screening of small molecule libraries is an important aspect of probe and drug discovery science. Numerous authors have suggested that bioactive natural products are attractive starting points for such libraries, due to their structural complexity and sp3-rich character. Here, we describe the construction of a screening library based on representative members of four families of biologically active alkaloids (Stemonaceae, the structurally related cyclindricine and lepadiformine families, lupin, and Amaryllidaceae). In each case, scaffolds were based on structures of the naturally occurring compounds or a close derivative. Scaffold preparation was pursued following the development of appropriate enabling chemical methods. Diversification provided 686 new compounds suitable for screening. The libraries thus prepared had structural characteristics, including sp3 content, comparable to a basis set of representative natural products and were highly rule-of-five compliant.
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Affiliation(s)
- Michael C McLeod
- Department of Medicinal Chemistry, Delbert M. Shankel Structural Biology Center, University of Kansas, 2034 Becker Drive, Lawrence, Kansas 66047, USA
| | - Gurpreet Singh
- Department of Medicinal Chemistry, Delbert M. Shankel Structural Biology Center, University of Kansas, 2034 Becker Drive, Lawrence, Kansas 66047, USA
| | - James N Plampin
- Department of Medicinal Chemistry, Delbert M. Shankel Structural Biology Center, University of Kansas, 2034 Becker Drive, Lawrence, Kansas 66047, USA
| | - Digamber Rane
- Department of Medicinal Chemistry, Delbert M. Shankel Structural Biology Center, University of Kansas, 2034 Becker Drive, Lawrence, Kansas 66047, USA
| | - Jenna L Wang
- Department of Medicinal Chemistry, Delbert M. Shankel Structural Biology Center, University of Kansas, 2034 Becker Drive, Lawrence, Kansas 66047, USA
| | - Victor W Day
- Department of Medicinal Chemistry, Delbert M. Shankel Structural Biology Center, University of Kansas, 2034 Becker Drive, Lawrence, Kansas 66047, USA
| | - Jeffrey Aubé
- Department of Medicinal Chemistry, Delbert M. Shankel Structural Biology Center, University of Kansas, 2034 Becker Drive, Lawrence, Kansas 66047, USA
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30
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Shao H, Zhang XM, Wang SH, Zhang FM, Tu YQ, Yang C. Propargylic cation-induced intermolecular electrophilic addition–semipinacol rearrangement. Chem Commun (Camb) 2014; 50:5691-5. [DOI: 10.1039/c3cc49650c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A novel propargylic electrophile-induced tandem intermolecular addition–semipinacol rearrangement was developed for the synthesis of a series of synthetically useful β-propargyl spirocyclic ketones. Its synthetic application was demonstrated by efficient construction of the key tricyclic moiety of daphlongamine E.
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Affiliation(s)
- Hui Shao
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000, P. R. China
| | - Xiao-Ming Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000, P. R. China
| | - Shao-Hua Wang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000, P. R. China
| | - Fu-Min Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000, P. R. China
| | - Yong-Qiang Tu
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000, P. R. China
| | - Chao Yang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000, P. R. China
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31
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Chen ZM, Bai W, Wang SH, Yang BM, Tu YQ, Zhang FM. Copper-Catalyzed Tandem Trifluoromethylation/Semipinacol Rearrangement of Allylic Alcohols. Angew Chem Int Ed Engl 2013; 52:9781-5. [DOI: 10.1002/anie.201304557] [Citation(s) in RCA: 224] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Indexed: 11/06/2022]
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32
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Chen ZM, Bai W, Wang SH, Yang BM, Tu YQ, Zhang FM. Copper-Catalyzed Tandem Trifluoromethylation/Semipinacol Rearrangement of Allylic Alcohols. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201304557] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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33
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Subba Reddy BV, Kumar H, Borkar P, Yadav JS, Sridhar B. The Prins Cascade Cyclization Reaction for the Synthesis of Angularly-Fused Tetrahydropyran and Piperidine Derivatives. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201387] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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34
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35
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Zhang QW, Zhang XB, Li BS, Xiang K, Zhang FM, Wang SH, Tu YQ. Catalytic intermolecular carbon electrophile induced semipinacol rearrangement. Chem Commun (Camb) 2013; 49:1648-50. [DOI: 10.1039/c2cc38585f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Gu P, Kang XY, Sun J, Wang BJ, Yi M, Li XQ, Xue P, Li R. Intramolecular Schmidt Reaction of Acyl Chlorides with Alkyl Azides: Rapid Access to Fused Polycyclic Nitrogen-Containing Heterocycles via a Multistep One-Pot Transformation. Org Lett 2012; 14:5796-9. [DOI: 10.1021/ol302890a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Peiming Gu
- Key Laboratory of Energy Sources & Engineering, and Department of Chemistry, Ningxia University, Yinchuan 750021, China.
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37
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Li B, Lai YC, Zhao Y, Wong YH, Shen ZL, Loh TP. Synthesis of 3-Oxaterpenoids and Its Application in the Total Synthesis of (±)-Moluccanic Acid Methyl Ester. Angew Chem Int Ed Engl 2012; 51:10619-23. [DOI: 10.1002/anie.201205981] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Indexed: 11/10/2022]
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38
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Li B, Lai YC, Zhao Y, Wong YH, Shen ZL, Loh TP. Synthesis of 3-Oxaterpenoids and Its Application in the Total Synthesis of (±)-Moluccanic Acid Methyl Ester. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205981] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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39
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Ma AJ, Tu YQ, Peng JB, Dou QY, Hou SH, Zhang FM, Wang SH. Total Synthesis of (−)-FR901483. Org Lett 2012; 14:3604-7. [DOI: 10.1021/ol301331t] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ai-Jun Ma
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Yong-Qiang Tu
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Jin-Bao Peng
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Qing-Yun Dou
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Si-Hua Hou
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Fu-Min Zhang
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Shao-Hua Wang
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
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40
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Subba Reddy B, Narasimhulu G, Vikram Reddy Y, Chakravarthy P, Yadav J, Sridhar B. Sc(OTf)3/TsOH: a highly efficient catalytic system for the synthesis of 2,6-dioxabicyclo[3,2,1]octane derivatives. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.04.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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41
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Abstract
Recent advances in radical azidation using sulfonyl azides are presented. For instance, radical carboazidation using α-iodoketones, desulfitative carboazidation, and anti-Markovnikov hydroazidation of alkenes are described. These novel methods tolerate a large number of functional groups and allow the synthesis of organic azides that would be difficult to synthesize otherwise. The transformation of the azides using reductive processes as well as a Schmidt reaction under nonacidic conditions were used to synthesize alkaloids including indolizidine 167B, monomorine I, cylindricine C, and lepadiformine C.
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42
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Liu R, Gutierrez O, Tantillo DJ, Aubé J. Stereocontrol in a combined allylic azide rearrangement and intramolecular Schmidt reaction. J Am Chem Soc 2012; 134:6528-31. [PMID: 22490078 DOI: 10.1021/ja300369c] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Pre-equilibration of an interconverting set of isomeric allylic azides is coupled with an intramolecular Schmidt reaction to afford substituted lactams stereoselectively. The effect of substitution and a preliminary mechanistic study are reported. The synthetic potential of this method is demonstrated in the context of an enantioselective synthesis of an advanced intermediate leading toward pinnaic acid.
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Affiliation(s)
- Ruzhang Liu
- Department of Medicinal Chemistry, Delbert M. Shankel Structural Biology Center, University of Kansas, 2034 Becker Drive, Lawrence, Kansas 66045, USA
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43
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Perry MA, Morin MD, Slafer BW, Rychnovsky SD. Total synthesis of lepadiformine alkaloids using N-Boc α-amino nitriles as trianion synthons. J Org Chem 2012; 77:3390-400. [PMID: 22413935 DOI: 10.1021/jo300161x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Lepadiformine A, B, and C were synthesized in an enantiomerically pure form using a reductive cyclization strategy. N-Boc α-amino nitriles were deprotonated and alkylated with enantiomerically pure dibromides to afford the first ring. The products were manipulated to introduce phosphate leaving groups, and subsequent reductive lithiation followed by intramolecular alkylation formed the second ring with high stereoselectivity. The third ring was formed by intramolecular displacement of a mesylate by the deprotected amine. Lepadiformine A and B contain a hydroxymethyl group adjacent to the amine. This appendage was introduced in a sequence using a Polonovski-Potier reaction as the key step. The synthetic strategy is stereoselective and convergent and demonstrates the utility of N-Boc α-amino nitriles as linchpins for alkaloid synthesis.
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Affiliation(s)
- Matthew A Perry
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, Irvine, California 92697, USA
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44
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Puppala M, Murali A, Baskaran S. Concise enantioselective construction of a bridged azatricyclic framework via domino semipinacol–Schmidt reaction. Chem Commun (Camb) 2012; 48:5778-80. [DOI: 10.1039/c2cc31906c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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Li BS, Yang BM, Wang SH, Zhang YQ, Cao XP, Tu YQ. Copper(i)-catalyzed intramolecular [2 + 2] cycloaddition of 1,6-enyne-derived ketenimine: an efficient construction of strained and bridged 7-substituted-3-heterobicyclo[3.1.1]heptan-6-one. Chem Sci 2012. [DOI: 10.1039/c2sc20109g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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46
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Abstract
Covering: 2010. Previous review: Nat. Prod. Rep., 2011, 28, 196. This review covers the literature published in 2010 for marine natural products, with 895 citations (590 for the period January to December 2010) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1003 for 2010), together with the relevant biological activities, source organisms and country of origin. Biosynthetic studies, first syntheses, and syntheses that lead to the revision of structures or stereochemistries, have been included.
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Affiliation(s)
- John W Blunt
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand.
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47
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Huh CW, Schroeder C, Singh G, Aubé J. Stereoselectivity in Nucleophilic Additions to 3-Azidoalkanals. J Org Chem 2011; 76:3160-5. [DOI: 10.1021/jo102597d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chan Woo Huh
- The University of Kansas Chemical Methodologies and Library Development Center, 2034 Becker Dr., Delbert M. Shankel Structural Biology Center, Lawrence, Kansas 66047, United States
| | - Chad Schroeder
- Department of Medicinal Chemistry, 1251 Wescoe Hall Drive, Malott Hall, Room 4070, University of Kansas, Lawrence, Kansas 66045, United States
| | - Gurpreet Singh
- Department of Medicinal Chemistry, 1251 Wescoe Hall Drive, Malott Hall, Room 4070, University of Kansas, Lawrence, Kansas 66045, United States
| | - Jeffrey Aubé
- The University of Kansas Chemical Methodologies and Library Development Center, 2034 Becker Dr., Delbert M. Shankel Structural Biology Center, Lawrence, Kansas 66047, United States
- Department of Medicinal Chemistry, 1251 Wescoe Hall Drive, Malott Hall, Room 4070, University of Kansas, Lawrence, Kansas 66045, United States
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48
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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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49
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Chen ZH, Tu YQ, Zhang SY, Zhang FM. Development of the Intramolecular Prins Cyclization/Schmidt Reaction for the Construction of the Azaspiro[4,4]nonane: Application to the Formal Synthesis of (±)-Stemonamine. Org Lett 2011; 13:724-7. [DOI: 10.1021/ol102955e] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhi-Hua Chen
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Yong-Qiang Tu
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Shu-Yu Zhang
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Fu-Min Zhang
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
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50
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Weidner K, Giroult A, Panchaud P, Renaud P. Efficient carboazidation of alkenes using a radical desulfonylative azide transfer process. J Am Chem Soc 2010; 132:17511-5. [PMID: 21082832 DOI: 10.1021/ja1068036] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The radical-mediated carboazidation of terminal alkenes using electrophilic alkanesulfonyl azides is reported. A single reagent delivers the necessary electrophilic alkyl radical as well as the azido group, and good yields are obtained by using a moderate excess of the carboazidating reagent (1.5-2 equiv). Interestingly, in addition to the starting sulfonyl azide, this method requires only the use of a radical initiator, di-tert-butyldiazene. In terms of atom economy, this azide transfer reaction is close to ideal, as SO2 (1 equiv) is the only side product. The synthetic potential of this process has been demonstrated by a formal synthesis of the alkaloid lepadiformine C.
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Affiliation(s)
- Karin Weidner
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
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