1
|
Aher RD, Ishikawa A, Yamanaka M, Tanaka F. Catalytic Enantioselective Construction of Decalin Derivatives by Dynamic Kinetic Desymmetrization of C2-Symmetric Derivatives through Aldol-Aldol Annulation. J Org Chem 2022; 87:8151-8157. [PMID: 35666096 DOI: 10.1021/acs.joc.2c00889] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have developed and investigated a catalytic desymmetrization reaction strategy that affords functionalized decalin derivatives with high enantioselectivities from C2-symmetric derivatives through aldol-aldol annulation. We identified the structural moieties of the catalyst necessary for the formation of the decalin derivative with high enantioselectivity. We elucidated the mechanisms of the catalyzed reactions: the first aldol reaction step was reversible, and the second aldol step was rate-limiting and stereochemistry-determining and was enantioselective. Using theoretical calculations guided by the experimental results, we identified the interactions between the catalyst and the transition state that led to the major enantiomer. The information obtained in this study will be useful for the development of catalysts and chemical transformations.
Collapse
Affiliation(s)
- Ravindra D Aher
- Chemistry and Chemical Bioengineering Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Okinawa 904-0495, Japan
| | - Atsuhiro Ishikawa
- Department of Chemistry, Rikkyo University, 3-34-1 Nish-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan
| | - Masahiro Yamanaka
- Department of Chemistry, Rikkyo University, 3-34-1 Nish-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Okinawa 904-0495, Japan
| |
Collapse
|
2
|
Wai H, Koelblen T, Hayes ME, Burris TP, Micalizio GC. Progress toward the De Novo Asymmetric Synthesis of Euphanes. Org Lett 2022; 24:3686-3690. [PMID: 35584298 DOI: 10.1021/acs.orglett.2c01299] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Progress toward an asymmetric synthesis of euphanes is described. A C14-desmethyl euphane system possessing five differentially substituted and electronically distinct alkenes has been prepared. The route employed is based on sequential metallacycle-mediated annulative cross-coupling, double asymmetric Brønsted acid mediated intramolecular Friedel-Crafts alkylation, and an oxidative rearrangement to establish the requisite C10 quaternary center. These studies have also led to the discovery of a novel euphane-based modulator of the Liver X Receptor.
Collapse
Affiliation(s)
- HtooTint Wai
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, New Hampshire 03755, United States
| | - Thomas Koelblen
- University of Florida, Genetics Institute, Gainesville, Florida 32610, United States
| | - Matthew E Hayes
- University of Florida, Genetics Institute, Gainesville, Florida 32610, United States
| | - Thomas P Burris
- University of Florida, Genetics Institute, Gainesville, Florida 32610, United States
| | - Glenn C Micalizio
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, New Hampshire 03755, United States
| |
Collapse
|
3
|
Santalla H, Gándara Z, Gómez-Bouzó U, Gómez G, Fall Y. Easy Access to Polyfunctionalized Chiral Decalins. ACS OMEGA 2020; 5:26049-26055. [PMID: 33073131 PMCID: PMC7557988 DOI: 10.1021/acsomega.0c03504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 09/21/2020] [Indexed: 06/11/2023]
Abstract
An unexpected ring expansion that converts hydrindanes into decalins via an unprecedented dyotropic reaction involving a mesylate group has been observed, and this paved the way for easy access to polyfunctionalized chiral decalins. These polyfunctionalized chiral decalins can be very useful building blocks for the synthesis of the thia analogues of many natural compounds. They can also be used in asymmetric catalysis and also in the synthesis of the new analogues of vitamin D with a modified D ring and side chain. The use of chiral sulfoxide ligands for asymmetric catalysis or asymmetric sulfur ylide-mediated epoxidation of carbonyl compounds is a very important topic in the field of organic chemistry, hence our results could be useful to the scientific community.
Collapse
Affiliation(s)
- Hugo Santalla
- Departamento
de Química Orgánica, Facultad de Química
and Instituto de Investigación Sanitaria Galicia Sur (IISGS), University of Vigo, Campus Marcosende, 36310 Vigo, Spain
- CITACA—Cluster
de Investigación é Transferencia Agroalimentaria do
Campus Auga, Universidad de Vigo, 32004 Ourense, Spain
| | - Zoila Gándara
- Departamento
de Química Orgánica, Facultad de Química
and Instituto de Investigación Sanitaria Galicia Sur (IISGS), University of Vigo, Campus Marcosende, 36310 Vigo, Spain
- CITACA—Cluster
de Investigación é Transferencia Agroalimentaria do
Campus Auga, Universidad de Vigo, 32004 Ourense, Spain
| | - Uxía Gómez-Bouzó
- Departamento
de Química Orgánica, Facultad de Química
and Instituto de Investigación Sanitaria Galicia Sur (IISGS), University of Vigo, Campus Marcosende, 36310 Vigo, Spain
- CITACA—Cluster
de Investigación é Transferencia Agroalimentaria do
Campus Auga, Universidad de Vigo, 32004 Ourense, Spain
| | - Generosa Gómez
- Departamento
de Química Orgánica, Facultad de Química
and Instituto de Investigación Sanitaria Galicia Sur (IISGS), University of Vigo, Campus Marcosende, 36310 Vigo, Spain
- CITACA—Cluster
de Investigación é Transferencia Agroalimentaria do
Campus Auga, Universidad de Vigo, 32004 Ourense, Spain
| | - Yagamare Fall
- Departamento
de Química Orgánica, Facultad de Química
and Instituto de Investigación Sanitaria Galicia Sur (IISGS), University of Vigo, Campus Marcosende, 36310 Vigo, Spain
- CITACA—Cluster
de Investigación é Transferencia Agroalimentaria do
Campus Auga, Universidad de Vigo, 32004 Ourense, Spain
| |
Collapse
|
4
|
Cheng Y, Klein CK, Tonks IA. Synthesis of pentasubstituted 2-aryl pyrroles from boryl and stannyl alkynes via one-pot sequential Ti-catalyzed [2 + 2 + 1] pyrrole synthesis/cross coupling reactions. Chem Sci 2020; 11:10236-10242. [PMID: 34094289 PMCID: PMC8162107 DOI: 10.1039/d0sc01576h] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 09/06/2020] [Indexed: 12/14/2022] Open
Abstract
Multisubstituted pyrroles are commonly found in many bioactive small molecule scaffolds, yet the synthesis of highly-substituted pyrrole cores remains challenging. Herein, we report an efficient catalytic synthesis of 2-heteroatom-substituted (9-BBN or SnR3) pyrroles via Ti-catalyzed [2 + 2 + 1] heterocoupling of heteroatom-substituted alkynes. In particular, the 9-BBN-alkyne coupling reactions were found to be very sensitive to Lewis basic ligands in the reaction: exchange of pyridine ligands from Ti to B inhibited catalysis, as evidenced by in situ 11B NMR studies. The resulting 2-boryl substituted pyrroles can then be used in Suzuki reactions in a one-pot sequential fashion, resulting in pentasubstituted 2-aryl pyrroles that are inaccessible via previous [2 + 2 + 1] heterocoupling strategies. This reaction provides a complementary approach to previous [2 + 2 + 1] heterocouplings of TMS-substituted alkynes, which could be further functionalized via electrophilic aromatic substitution.
Collapse
Affiliation(s)
- Yukun Cheng
- Department of Chemistry, University of Minnesota - Twin Cities 207 Pleasant St SE Minneapolis Minnesota 55455 USA
| | - Channing K Klein
- Department of Chemistry, University of Minnesota - Twin Cities 207 Pleasant St SE Minneapolis Minnesota 55455 USA
| | - Ian A Tonks
- Department of Chemistry, University of Minnesota - Twin Cities 207 Pleasant St SE Minneapolis Minnesota 55455 USA
| |
Collapse
|
5
|
Manßen M, Schafer LL. Titanium catalysis for the synthesis of fine chemicals – development and trends. Chem Soc Rev 2020; 49:6947-6994. [DOI: 10.1039/d0cs00229a] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Atlas as a Titan(ium) is holding the earth-abundant chemistry world. Titanium is the second most abundant transition metal, is a key player in important industrial processes (e.g. polyethylene) and shows much promise for diverse applications in the future.
Collapse
Affiliation(s)
- Manfred Manßen
- The Department of Chemistry
- The University of British Columbia
- Vancouver
- Canada
| | - Laurel L. Schafer
- The Department of Chemistry
- The University of British Columbia
- Vancouver
- Canada
| |
Collapse
|
6
|
Beaumier EP, Pearce AJ, See XY, Tonks IA. Modern applications of low-valent early transition metals in synthesis and catalysis. Nat Rev Chem 2019; 3:15-34. [PMID: 30989127 PMCID: PMC6462221 DOI: 10.1038/s41570-018-0059-x] [Citation(s) in RCA: 132] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Low-valent early transition metals are often intrinsically highly reactive as a result of their strong propensity toward oxidation to more stable high-valent states. Harnessing these highly reducing complexes for productive reactivity is potentially powerful for C-C bond construction, organic reductions, small-molecule activation and many other reactions that offer orthogonal chemoselectivity and/or regioselectivity patterns to processes promoted by late transition metals. Recent years have seen many exciting new applications of low-valent metals through building new catalytic and/or multicomponent reaction manifolds out of classical reactivity patterns. In this Review, we survey new methods that employ early transition metals and invoke low-valent precursors or intermediates in order to identify common themes and strategies in synthesis and catalysis.
Collapse
Affiliation(s)
- Evan P. Beaumier
- Department of Chemistry, University of Minnesota, Minneapolis, MN, USA
| | - Adam J. Pearce
- Department of Chemistry, University of Minnesota, Minneapolis, MN, USA
| | - Xin Yi See
- Department of Chemistry, University of Minnesota, Minneapolis, MN, USA
| | - Ian A. Tonks
- Department of Chemistry, University of Minnesota, Minneapolis, MN, USA
| |
Collapse
|
7
|
Chouthaiwale PV, Aher RD, Tanaka F. Catalytic Enantioselective Formal (4+2) Cycloaddition by Aldol-Aldol Annulation of Pyruvate Derivatives with Cyclohexane-1,3-Diones to Afford Functionalized Decalins. Angew Chem Int Ed Engl 2018; 57:13298-13301. [PMID: 30125444 DOI: 10.1002/anie.201808219] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Indexed: 01/12/2023]
Abstract
The decalin structure is found in bioactive molecules. We have developed catalytic enantioselective formal (4+2) cycloaddition reactions via aldol-aldol cascade reactions between pyruvate-derived diketoester derivatives and cyclohexane-1,3-dione derivatives that afford highly functionalized decalin derivatives. The reactions were performed using a quinidine-derived catalyst under mild conditions. Decalin derivatives bearing up to six chiral carbon centers including tetrasubstituted carbon centers were synthesized with high diastereo- and enantioselectivities. Five to six stereogenic centers were generated from achiral molecules with the formation of two C-C bonds in a single transformation resulting in the formation of the decalin system.
Collapse
Affiliation(s)
- Pandurang V Chouthaiwale
- Chemistry and Chemical Bioengineering Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Okinawa, 904-0495, Japan
| | - Ravindra D Aher
- Chemistry and Chemical Bioengineering Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Okinawa, 904-0495, Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Okinawa, 904-0495, Japan
| |
Collapse
|
8
|
Chouthaiwale PV, Aher RD, Tanaka F. Catalytic Enantioselective Formal (4+2) Cycloaddition by Aldol–Aldol Annulation of Pyruvate Derivatives with Cyclohexane‐1,3‐Diones to Afford Functionalized Decalins. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201808219] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Pandurang V. Chouthaiwale
- Chemistry and Chemical Bioengineering UnitOkinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna Okinawa 904-0495 Japan
| | - Ravindra D. Aher
- Chemistry and Chemical Bioengineering UnitOkinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna Okinawa 904-0495 Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering UnitOkinawa Institute of Science and Technology Graduate University 1919-1 Tancha Onna Okinawa 904-0495 Japan
| |
Collapse
|
9
|
Hung K, Hu X, Maimone TJ. Total synthesis of complex terpenoids employing radical cascade processes. Nat Prod Rep 2018; 35:174-202. [PMID: 29417970 PMCID: PMC5858714 DOI: 10.1039/c7np00065k] [Citation(s) in RCA: 121] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Covering: 2011-2017Radical cyclizations have a rich history in organic chemistry and have been particularly generous to the field of natural product synthesis. Owing to their ability to operate in highly congested molecular quarters, and with significant functional group compatibility, these transformations have enabled the synthesis of numerous polycyclic terpenoid natural products over the past several decades. Moreover, when programmed accordingly into a synthetic plan, radical cascade processes can be used to rapidly assemble molecular complexity, much in the same way nature rapidly constructs terpene frameworks through cationic cyclization pathways. This review highlights recent total syntheses of complex terpenoids (from 2011-2017) employing C-C bond-forming radical cascade sequences.
Collapse
Affiliation(s)
- Kevin Hung
- Department of Chemistry, University of California - Berkeley, Berkeley, CA 94720, USA.
| | | | | |
Collapse
|
10
|
Siemiaszko G, Six Y. Can the Ti(OiPr) 4/ nBuLi combination of reagents function as a catalyst for [2+2+2] alkyne cyclotrimerisation reactions? NEW J CHEM 2018. [DOI: 10.1039/c8nj04931a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Catalysis of the cyclotrimerisation of alkynes with the Ti(OiPr)4/nBuLi system was studied, leading to the development of a particularly convenient and reliable protocol.
Collapse
Affiliation(s)
- Gabriela Siemiaszko
- Laboratoire de Synthèse Organique (LSO)
- UMR 7652 CNRS/ENSTA/École Polytechnique
- Université Paris-Saclay
- 91128 Palaiseau Cedex
- France
| | - Yvan Six
- Laboratoire de Synthèse Organique (LSO)
- UMR 7652 CNRS/ENSTA/École Polytechnique
- Université Paris-Saclay
- 91128 Palaiseau Cedex
- France
| |
Collapse
|
11
|
Shalit ZA, Micalizio GC. A Highly Chemo-, Regio-, and Stereoselective Metallacycle-Mediated Annulation Between a Conjugated Enyne and an Ene-Diyne. ARKIVOC 2018; 2018:132-138. [PMID: 31742254 DOI: 10.24820/ark.5550190.p010.487] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Alkoxide-directed metal-centered intermolecular [2+2+2] annulation is shown to chemo-, regio-, and stereoselectively engage two polyunsaturated substrate in productive cyclization chemistry. This annulation process is unique in the field, revealing that it is possible to selectively engage three of five π-systems residing in the coupling partners in initial [2+2+2] reaction, and demonstrating that one of the two remaining π-systems (the TMS-alkyne) can ultimately serve to simply generate a new metallacyclopentene of great potential value in additional metallacycle-mediated coupling chemistry.
Collapse
Affiliation(s)
- Zachary A Shalit
- Department of Chemistry, Burke Laboratory, Dartmouth College, Hanover, NH 03755
| | - Glenn C Micalizio
- Department of Chemistry, Burke Laboratory, Dartmouth College, Hanover, NH 03755
| |
Collapse
|
12
|
Kier MJ, Leon RM, O'Rourke NF, Rheingold AL, Micalizio GC. Synthesis of Highly Oxygenated Carbocycles by Stereoselective Coupling of Alkynes to 1,3- and 1,4-Dicarbonyl Systems. J Am Chem Soc 2017; 139:12374-12377. [PMID: 28844136 PMCID: PMC5600187 DOI: 10.1021/jacs.7b06286] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Densely substituted and highly oxygenated carbocycles are challenging targets for synthesis. In particular, those possessing numerous contiguous, fully substituted carbon atoms (i.e., tertiary alcohols and quaternary centers) are often not accessible in a direct fashion, necessitating the strategic decoupling of ring-formation from the establishment of functionality about the system. Here, we describe an approach to the construction of highly oxygenated mono-, di-, and polycyclic carbocycles from the reaction of disubstituted alkynes with β- or γ-dicarbonyl systems. These processes embrace a variant of metallacycle-mediated annulation chemistry where initial alkyne-carbonyl coupling is followed by a second, now intramolecular, stereoselective C-C bond-forming event. In addition to revealing the basic reactivity pattern in intermolecular settings, we demonstrate that this class of reactivity is quite powerful in a fully intramolecular context and, when terminated by a stereoselective oxidation process, can be used to generate polycyclic systems containing a fully substituted and highly oxygenated five-membered ring.
Collapse
Affiliation(s)
- Matthew J Kier
- Department of Chemistry, Burke Laboratory, Dartmouth College , Hanover, New Hampshire 03755, United States
| | - Robert M Leon
- Department of Chemistry, Burke Laboratory, Dartmouth College , Hanover, New Hampshire 03755, United States
| | - Natasha F O'Rourke
- Department of Chemistry, Burke Laboratory, Dartmouth College , Hanover, New Hampshire 03755, United States
| | - Arnold L Rheingold
- Department of Chemistry, University of California-San Diego , La Jolla, California 92093, United States
| | - Glenn C Micalizio
- Department of Chemistry, Burke Laboratory, Dartmouth College , Hanover, New Hampshire 03755, United States
| |
Collapse
|
13
|
Santalla H, Faza ON, Gómez G, Fall Y, Silva López C. From Hydrindane to Decalin: A Mild Transformation through a Dyotropic Ring Expansion. Org Lett 2017. [PMID: 28641016 DOI: 10.1021/acs.orglett.7b01621] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An unexpected ring expansion converting hydrindane cores into decalins has been observed. The process occurs under very mild conditions and with exquisite transfer of chiral information. The ring expansion provides access to decorated decalins with complete stereocontrol. The reaction mechanism is studied in order to gain insight into the underlying causes for the low thermal requirements in this reaction and the nature of the chirality transfer process. Interestingly, both result from an unprecedented dyotropic reaction involving a mesylate group.
Collapse
Affiliation(s)
- Hugo Santalla
- Departamento de Química Orgánica, Campus Lagoas-Marcosende , 36310 Vigo, Spain
| | - Olalla Nieto Faza
- Departamento de Química Orgánica, Campus Lagoas-Marcosende , 36310 Vigo, Spain
| | - Generosa Gómez
- Departamento de Química Orgánica and Instituto de Investigación Sanitaria Galicia Sur (IISGS), Campus Lagoas-Marcosende , 36310 Vigo, Spain
| | - Yagamare Fall
- Departamento de Química Orgánica and Instituto de Investigación Sanitaria Galicia Sur (IISGS), Campus Lagoas-Marcosende , 36310 Vigo, Spain
| | - Carlos Silva López
- Departamento de Química Orgánica, Campus Lagoas-Marcosende , 36310 Vigo, Spain
| |
Collapse
|
14
|
Micalizio GC, Mizoguchi H. The Development of Alkoxide-Directed Metallacycle-Mediated Annulative Cross-Coupling Chemistry. Isr J Chem 2017; 57:228-238. [PMID: 28652644 PMCID: PMC5482546 DOI: 10.1002/ijch.201600098] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Alkoxide-directed metallacycle-mediated cross-coupling is a rapidly growing area of reaction methodology in organic chemistry. Over the last decade, developments have resulted in > thirty new and highly selective intermolecular (or "convergent") C-C bond-forming reactions that have established powerful retrosynthetic relationships in stereoselective synthesis. While early studies were focused on developing transformations that forge a single C-C bond by way of a functionalized and unsaturated metallacyclopentane intermediate, recent advances mark the ability to employ this organometallic intermediate in additional stereoselective transformations. Among these more advanced coupling processes, those that embrace the metallacycle in subsequent [4+2] chemistry have resulted in the realization of a number of highly selective annulative cross-coupling reactions that deliver densely functionalized and angularly substituted carbocycles. This review discusses the early development of this chemistry, recent advances in reaction methodology, and shares a glimpse of the power of these processes in natural product synthesis.
Collapse
|
15
|
Sun Z, Hu S, Huo Y, Wang Z. Titanium tetrachloride-mediated synthesis of N-aryl-substituted azacycles from cyclic ethers. RSC Adv 2017. [DOI: 10.1039/c6ra27325d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Five- and six-membered N-aryl-substituted azacycles were synthesized from amines and cyclic ethers under mild conditions while no expensive metal reagent was required.
Collapse
Affiliation(s)
- Zunming Sun
- State Key Laboratory and Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- P. R. China
| | - Shanshan Hu
- State Key Laboratory and Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- P. R. China
| | - Yan Huo
- State Key Laboratory and Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- P. R. China
| | - Zhihong Wang
- State Key Laboratory and Institute of Elemento-Organic Chemistry
- Nankai University
- Tianjin 300071
- P. R. China
| |
Collapse
|
16
|
Cao Z, Zhu H, Meng X, Tian L, Chen G, Sun X, You J. Silver-Catalyzed Domino Reaction of ortho-Carbonylated Alkynyl-Substituted Arylaldehydes with Conjugated Dienes: Stereoselective Access to Indanone-Fused Cyclohexenes. J Org Chem 2016; 81:12401-12407. [PMID: 27978729 DOI: 10.1021/acs.joc.6b02529] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A silver-catalyzed domino reaction of ortho-carbonylated alkynyl-substituted arylaldehydes with conjugated dienes is described here. Through this reaction, the synthesis of a variety of indanone-fused cyclohexene derivatives can be achieved efficiently. The formation of these tricyclic products could involve a key Diels-Alder reaction of in situ generated indanenone dienophiles with conjugated dienes. Particularly, the products can be accomplished in a high endo/exo selective way.
Collapse
Affiliation(s)
- Ziping Cao
- School of Chemistry and Chemical Engineering, Qufu Normal University , Qufu 273165, P. R. China.,Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University , Qufu 273165, Shandong, China
| | - Hongbo Zhu
- School of Chemistry and Chemical Engineering, Qufu Normal University , Qufu 273165, P. R. China.,Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University , Qufu 273165, Shandong, China
| | - Xin Meng
- School of Chemistry and Chemical Engineering, Qufu Normal University , Qufu 273165, P. R. China.,Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University , Qufu 273165, Shandong, China
| | - Laijin Tian
- School of Chemistry and Chemical Engineering, Qufu Normal University , Qufu 273165, P. R. China.,Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University , Qufu 273165, Shandong, China
| | - Guang Chen
- School of Chemistry and Chemical Engineering, Qufu Normal University , Qufu 273165, P. R. China.,Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University , Qufu 273165, Shandong, China
| | - Xuejun Sun
- School of Chemistry and Chemical Engineering, Qufu Normal University , Qufu 273165, P. R. China.,Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University , Qufu 273165, Shandong, China
| | - Jinmao You
- School of Chemistry and Chemical Engineering, Qufu Normal University , Qufu 273165, P. R. China.,Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University , Qufu 273165, Shandong, China
| |
Collapse
|
17
|
Berkes B, Ozsváth K, Molnár L, Gáti T, Holczbauer T, Kardos G, Soós T. Expedient and Diastereodivergent Assembly of Terpenoid Decalin Subunits having Quaternary Stereocenters through Organocatalytic Robinson Annulation of Nazarov Reagent. Chemistry 2016; 22:18101-18106. [DOI: 10.1002/chem.201604541] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Indexed: 12/18/2022]
Affiliation(s)
- Barbara Berkes
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - Kristóf Ozsváth
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - Laura Molnár
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - Tamás Gáti
- Servier Research Institute of Medicinal Chemistry; Záhony Street 7 1031 Budapest Hungary
| | - Tamás Holczbauer
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - György Kardos
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - Tibor Soós
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| |
Collapse
|
18
|
Mizoguchi H, Micalizio GC. Synthesis of Angularly Substituted trans-Fused Decalins through a Metallacycle-Mediated Annulative Cross-Coupling Cascade. Angew Chem Int Ed Engl 2016; 55:13099-13103. [PMID: 27634059 PMCID: PMC5056368 DOI: 10.1002/anie.201606962] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Indexed: 01/07/2023]
Abstract
A convergent coupling reaction is described that enables the stereoselective construction of angularly substituted trans-fused decalins from acyclic precursors. The process builds on our alkoxide-directed titanium-mediated alkyne-alkyne coupling and employs a 1,7-enyne coupling partner. Overall, the reaction is thought to proceed through initial formation of a tetrasusbstituted metallacyclopentadiene, stereoselective intramolecular [4+2] cycloaddition, elimination, isomerization, and regio- and stereoselective protonation. Distinct from our early studies directed at the synthesis of trans-fused hydrindanes, the current annulative coupling reveals an important effect of TMSCl in controlling the final protonation-the event that establishes the stereochemistry of the ring fusion.
Collapse
Affiliation(s)
- Haruki Mizoguchi
- Department of Chemistry, Dartmouth College, 6128 Burke Laboratory, Hanover, NH, 03755, USA
| | - Glenn C Micalizio
- Department of Chemistry, Dartmouth College, 6128 Burke Laboratory, Hanover, NH, 03755, USA.
| |
Collapse
|
19
|
Mizoguchi H, Micalizio GC. Synthesis of Angularly Substituted trans
-Fused Decalins through a Metallacycle-Mediated Annulative Cross-Coupling Cascade. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201606962] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Haruki Mizoguchi
- Department of Chemistry; Dartmouth College; 6128 Burke Laboratory Hanover NH 03755 USA
| | - Glenn C. Micalizio
- Department of Chemistry; Dartmouth College; 6128 Burke Laboratory Hanover NH 03755 USA
| |
Collapse
|
20
|
Ying W, Zhang L, Wiget PA, Herndon JW. A novel stereoselective [8+2] double cycloaddition route to hydronaphthalene ring systems. Tetrahedron Lett 2016; 57:2954-2956. [PMID: 27795589 PMCID: PMC5082427 DOI: 10.1016/j.tetlet.2016.05.059] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Substituted hydronaphthalenes where each of the ten carbons of the two-ring system contains functionality were obtained through a tandem [8+2] cycloaddition and base-catalyzed rearrangement process using dienylfurans and electron-deficient alkynes. If the [8+2] process is conducted under solvent-free conditions the process could be conducted in a single reaction flask without isolation of the chromatographically sensitive [8+2] cycloadducts. A mechanism involving base catalysed alkene positional isomerization followed by disrotatory electrocyclic ring closure was proposed for the key reaction step that converts [8+2] cycloadducts to hydronaphthalenes. The products undergo selective ring opening-isomerization processes upon treatment with Lewis acids.
Collapse
Affiliation(s)
- Weijiang Ying
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003 USA
| | - Lei Zhang
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003 USA
| | - Paul A. Wiget
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003 USA
| | - James W. Herndon
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003 USA
| |
Collapse
|
21
|
Aquino C, Greszler SN, Micalizio GC. Synthesis of the Cortistatin Pentacyclic Core by Alkoxide-Directed Metallacycle-Mediated Annulative Cross-Coupling. Org Lett 2016; 18:2624-7. [PMID: 27193994 PMCID: PMC4892975 DOI: 10.1021/acs.orglett.6b01048] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The pentacyclic core skeleton of the cortistatins has been prepared in a stereoselective fashion by strategic use of an alkoxide-directed metallacycle-mediated annulative cross-coupling. This metal-centered tandem reaction delivers a polyunsaturated hydrindane and establishes the C13 stereodefined quaternary center with high levels of stereocontrol. Subsequent regio- and stereoselective global hydroboration results in the realization of the DE-trans ring fusion and a tertiary alcohol at C8. Establishment of the ABC-tricyclic subunit was then accomplished through phenolic oxidation/trans-acetalization, chemoselective reduction, regioselective cleavage, and intramolecular alkylation at C5.
Collapse
Affiliation(s)
- Claudio Aquino
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, NH 03755
- Department of Chemistry, The Scripps Research Institute, Jupiter, FL 33458
| | | | - Glenn C. Micalizio
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, NH 03755
- Department of Chemistry, The Scripps Research Institute, Jupiter, FL 33458
| |
Collapse
|
22
|
Cheng X, Micalizio GC. Synthesis of Neurotrophic Seco-prezizaane Sesquiterpenes (1R,10S)-2-Oxo-3,4-dehydroneomajucin, (2S)-Hydroxy-3,4-dehydroneomajucin, and (-)-Jiadifenin. J Am Chem Soc 2016; 138:1150-3. [PMID: 26785051 PMCID: PMC4879688 DOI: 10.1021/jacs.5b12694] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An asymmetric approach to the synthesis of neurotrophic seco-prezizaane sesquiterpenes is described that is based on the strategic application of a hydroxyl-directed metallacycle-mediated [2 + 2 + 2] annulation and an intramolecular radical cyclization cascade. Targets prepared are among the most potent members of the natural product class and include (1R,10S)-2-oxo-3,4-dehydroneomajucin, (2S)-hydroxy-3,4-dehydroneomajucin, and (-)-jiadifenin. In addition to representing the first application of the alkoxide-directed metallacycle-mediated hydrindane-forming annulation reaction in natural product synthesis and the first total synthesis of (2S)-hydroxy-3,4-dehydroneomajucin, these pursuits have resulted in the elucidation of a complex radical cascade process for installation of the C5 quaternary center common to the natural product class.
Collapse
Affiliation(s)
- Xiayun Cheng
- Department of Chemistry, Burke Laboratory, Dartmouth College, Hanover, NH 03755
| | - Glenn C. Micalizio
- Department of Chemistry, Burke Laboratory, Dartmouth College, Hanover, NH 03755
| |
Collapse
|