1
|
Kotha S, Solanke BU. Diversity Oriented Approach to New Tetrahedral Building Blocks by Ring‐Closing Metathesis. ChemistrySelect 2023. [DOI: 10.1002/slct.202204906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry Indian Institute of Technology–Bombay Powai Mumbai 400 076 India
| | - Balaji U. Solanke
- Department of Chemistry Indian Institute of Technology–Bombay Powai Mumbai 400 076 India
| |
Collapse
|
2
|
Reshuffle Bonds by Ball Milling: A Mechanochemical Protocol for Charge-Accelerated Aza-Claisen Rearrangements. Molecules 2023; 28:molecules28020807. [PMID: 36677865 PMCID: PMC9860570 DOI: 10.3390/molecules28020807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 01/02/2023] [Accepted: 01/07/2023] [Indexed: 01/15/2023] Open
Abstract
This study presents the development of a mechanochemical protocol for a charge-accelerated aza-Claisen rearrangement. The protocol waives the use of commonly applied transition metals, ligands, or pyrophoric Lewis acids, e.g., AlMe3. Based on (heterocyclic) tertiary allylamines and acyl chlorides, the desired tertiary amides were prepared in yields ranging from 17% to 84%. Moreover, the same protocol was applied for a Belluš-Claisen-type rearrangement resulting in the synthesis of a 9-membered lactam without further optimization.
Collapse
|
3
|
Kotha S, Nandan Chaurasia U, Ansari S. Early and Late‐Stage Functionalization of Cage Systems: Stereochemically Divergent Synthesis of Oxa‐cages
via
Olefin Metathesis. ChemistrySelect 2022. [DOI: 10.1002/slct.202202497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry Indian Institute of Technology, Bombay Powai 400076 Mumbai India
| | - Usha Nandan Chaurasia
- Department of Chemistry Indian Institute of Technology, Bombay Powai 400076 Mumbai India
| | - Saima Ansari
- Department of Chemistry Indian Institute of Technology, Bombay Powai 400076 Mumbai India
| |
Collapse
|
4
|
Kotha S, Solanke BU. Construction of Unusual Amino Acid derivatives and Bis‐Fused Oxacycles via Ring‐Closing Metathesis. ChemistrySelect 2022. [DOI: 10.1002/slct.202203906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry Indian Institute of Technology–Bombay Powai Mumbai 400 076 India
| | - Balaji U. Solanke
- Department of Chemistry Indian Institute of Technology–Bombay Powai Mumbai 400 076 India
| |
Collapse
|
5
|
Kotha S, Solanke BU, Agarwala PK, Kapoor S. Design and synthesis of hetero-steroids via ring-closing metathesis: Biological studies towards in vitro anticancer activity. Steroids 2022; 188:109119. [PMID: 36202314 DOI: 10.1016/j.steroids.2022.109119] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 09/27/2022] [Accepted: 09/30/2022] [Indexed: 11/15/2022]
Abstract
Here, we report a synthetic approach to hetero-steroids and also studied their biological activities as anticancer agents. A novel class of oxacycles containing estrone moiety were synthesized in this report. Allyl ether derived from estrone underwent Claisen rearrangement (CR) and again O-allylation and subsequent ring-closure gave A-ring-furan and oxepine fused derivatives in high yields. We used double bond isomerization and ring-closing metathesis (RCM) as key steps to assemble hetero steroids containing a mixture of regio isomers like benzofurans and benzoxepine moieties. The novel benzofuran and benzoxepine-based hybrid steroid derivatives were subjected to in vitro cytotoxicity analysis and were found to exert cancer cell-specific activity.
Collapse
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India.
| | - Balaji U Solanke
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
| | - Prema Kumari Agarwala
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
| | - Shobhna Kapoor
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
| |
Collapse
|
6
|
Kotha S, Singh D. Synthesis of Pyrrole Derivatives via Ring Closing Metathesis, Clauson-Kaas Reaction and Paal-Knorr Condensation as Key Steps. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.134600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
7
|
Kotha S, Ansari S, Gupta NK. Annulation Tactics of cis-syn-cis Triquinanes by Allylsilanes: Application of Hosomi-Sakurai Reaction Conditions. Chem Asian J 2022; 17:e202200497. [PMID: 35796548 DOI: 10.1002/asia.202200497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Revised: 06/06/2022] [Indexed: 11/07/2022]
Abstract
A stereoselective [3+2] cycloaddition approach to functionalized pentaquinanes starting from cis-syn-cis triquinanes, derived from Cookson's diones, is reported. This transformation involves generation of six new stereocenters in a single step leading to cis-anti-cis-syn-cis-anti-cis polyquinane systems. Our method prevents transannular cyclizations which are prevalent in these moieties. The structure and stereochemistry of target molecules are well-characterized based on NMR data and X-ray diffraction studies.
Collapse
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai, 400076, India
| | - Saima Ansari
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai, 400076, India
| | - Naveen K Gupta
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai, 400076, India
| |
Collapse
|
8
|
Kotha S, Gaikwad V. Synthesis of Unusual Amino Acid Derivatives Containing Bicyclo[2.2.2]octane Unit by the Diels‐Alder Approach Involving Pentacene. ChemistrySelect 2022. [DOI: 10.1002/slct.202201114] [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)
- Sambasivarao Kotha
- Department of Chemistry Indian Institute of Technology, Bombay Powai Mumbai 400076 India
| | - Vidyasagar Gaikwad
- Department of Chemistry Indian Institute of Technology, Bombay Powai Mumbai 400076 India
| |
Collapse
|
9
|
Kotha S, Agrawal A, Tangella Y. Synthesis of mixed musks via Eschenmoser-Tanabe fragmentation, enyne metathesis and Diels-Alder reaction as key steps. RSC Adv 2022; 12:14278-14281. [PMID: 35558836 PMCID: PMC9092383 DOI: 10.1039/d2ra01458k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Accepted: 05/02/2022] [Indexed: 12/03/2022] Open
Abstract
Musk analogues containing different macrocyclic ring systems as well as different annulated ring systems were synthesised by a simple and useful strategy. This strategy includes Eschenmoser-Tanabe fragmentation, enyne metathesis and Diels-Alder reaction as key steps. Starting from easily available (n) macrocyclic ketones, (n + 3) macrocyclic systems were assembled using the basic organic reactions.
Collapse
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology Bombay, Powai Mumbai 400076 Maharashtra India
| | - Arpit Agrawal
- Department of Chemistry, Indian Institute of Technology Bombay, Powai Mumbai 400076 Maharashtra India
| | - Yellaiah Tangella
- Department of Chemistry, Indian Institute of Technology Bombay, Powai Mumbai 400076 Maharashtra India
| |
Collapse
|
10
|
Kotha S, Gaikwad V. Functionalization of Meldrum’s Acid by Diels‒Alder Approach. HETEROCYCLES 2022. [DOI: 10.3987/com-21-14574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
11
|
Design and synthesis of C3-symmetric molecules containing oxepine and benzofuran moieties via Metathesis. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130907] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
12
|
Kotha S, Cheekatla SR, Meshram M. Design and Synthesis of Cage Molecules as High Energy Density Materials for Aerospace Applications. ChemCatChem 2020. [DOI: 10.1002/cctc.202001475] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400 076 India
| | - Subba Rao Cheekatla
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400 076 India
| | - Milind Meshram
- Department of Chemistry The K.R.T. Arts B.H. Commerce & A.M. Science College Nashik 422 002 India
| |
Collapse
|
13
|
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry Indian Institute of Technology-Bombay, Powai Mumbai 400076 India
| | - Ambareen Fatma
- Department of Chemistry Indian Institute of Technology-Bombay, Powai Mumbai 400076 India
| |
Collapse
|
14
|
Kotha S, Cheekatla SR, Fatma A. Synthetic Approach to the ABCD Ring System of Anticancer Agent Fredericamycin A via Claisen Rearrangement and Ring-Closing Metathesis as Key Steps. ACS OMEGA 2019; 4:17109-17116. [PMID: 31656883 PMCID: PMC6811863 DOI: 10.1021/acsomega.9b01178] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 09/23/2019] [Indexed: 06/10/2023]
Abstract
A new synthetic strategy to the ABCD ring system of the anticancer agent fredericamycin A (NSC-305263) was realized by the Diels-Alder reaction and olefin metathesis as key steps. The tactics developed here for the construction of the ABCD ring system also involve double Claisen rearrangement followed by a retro-Diels-Alder reaction and ring-closing metathesis. The metathesis approach performs a key role in the construction of A and D rings of the ABCD core unit. More importantly, ABCD fragment synthesis was accomplished without the involvement of protecting groups.
Collapse
|
15
|
Kotha S, Meshram M. Development of New Synthetic Strategies, Tactics and their Applications. CHEM REC 2019; 19:2480-2504. [DOI: 10.1002/tcr.201900041] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 09/18/2019] [Accepted: 09/19/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Sambasivarao Kotha
- Department of ChemistryIndian Institute of Technology Bombay Powai Mumbai- 400 076 India
| | - Milind Meshram
- Department of ChemistryIndian Institute of Technology Bombay Powai Mumbai- 400 076 India
| |
Collapse
|
16
|
Eshghi H, Bakavoli M, Hosseini M. Efficient synthesis of dihydrazide crown ethers by fast addition method. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/030823406779173424] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The novel macrocyclic dihydrazides which structurally related to luminal were synthesised. These compounds were obtained in the macrocyclisation step by fast addition method and the results were compared with solvent-free conditions.
Collapse
Affiliation(s)
- Hossein Eshghi
- Department of Chemistry, Ferdowsi University of Mashhad, Mashhad 91775-1436, Iran
| | - Mehdi Bakavoli
- Department of Chemistry, Ferdowsi University of Mashhad, Mashhad 91775-1436, Iran
| | - Mosayyeb Hosseini
- Department of Chemistry, Sistan and Baluchestan University Zahedan 98135-674, Iran
| |
Collapse
|
17
|
Kotha S, Meshram M. Application of Claisen Rearrangement and Olefin Metathesis in Organic Synthesis. Chem Asian J 2018; 13:1758-1766. [PMID: 29956880 DOI: 10.1002/asia.201800613] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 05/17/2018] [Indexed: 11/07/2022]
Abstract
Several new synthetic methods to diverse polycycles and heterocycles on the basis of [3,3]-sigmatropic rearrangement and ring-closing metathesis as key steps are summarized. In this regard, Claisen, aza-Claisen, and Overman rearrangements are used in combination with other popular reactions such as ring-closing metathesis, Suzuki coupling, Diels-Alder reaction, and retro-Diels-Alder reaction. To this end, we prepared polycycles (e.g., cyclophanes, cage molecules), heterocycles (e.g., oxepins, azapins), carbocycles, and spirocycles with the use of the above protocol.
Collapse
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-, 400 076, India
| | - Milind Meshram
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-, 400 076, India
| |
Collapse
|
18
|
Kotha S, Cheekatla SR. A New Synthetic Approach toC2-Symmetric Octacyclic Cage Diol via Claisen Rearrangement and Ring-Closing Metathesis as Key Steps. ChemistrySelect 2017. [DOI: 10.1002/slct.201701633] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry; Indian Institute of Technology-Bombay; Mumbai-Powai 400076 India
| | - Subba Rao Cheekatla
- Department of Chemistry; Indian Institute of Technology-Bombay; Mumbai-Powai 400076 India
| |
Collapse
|
19
|
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry; Indian Institute of Technology-Bombay; Powai 400076 Mumbai India
| | | | - Rashid Ali
- Department of Chemistry; Indian Institute of Technology-Bombay; Powai 400076 Mumbai India
| |
Collapse
|
20
|
Kotha S, Gunta R. Bridgehead vicinal diallylation of norbornene derivatives and extension to propellane derivatives via ring-closing metathesis. Beilstein J Org Chem 2016; 12:1877-1883. [PMID: 27829894 PMCID: PMC5082723 DOI: 10.3762/bjoc.12.177] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Accepted: 08/03/2016] [Indexed: 01/25/2023] Open
Abstract
Here, we report a simple synthetic strategy to the bridgehead vicinal diallylation of norbornene derivatives. These substrates are useful to generate propellanes via ring-closing metathesis. Single-crystal X-ray diffraction analysis of four compounds led to the realization of configurational correction of earlier reported molecules.
Collapse
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai, India
| | - Rama Gunta
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai, India
| |
Collapse
|
21
|
Kotha S, Gunta R. A new synthetic strategy to 2,3-diallyl-1,4-quinones via one-pot double Claisen rearrangement and retro Diels–Alder reaction. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.05.101] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
22
|
Kotha S, Aswar VR. Target Specific Tactics in Olefin Metathesis: Synthetic Approach to cis-syn-cis-Triquinanes and -Propellanes. Org Lett 2016; 18:1808-11. [DOI: 10.1021/acs.orglett.6b00537] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai, 400 076, India
| | - Vikas R. Aswar
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai, 400 076, India
| |
Collapse
|
23
|
Kotha S, E. Shirbhate M, Kumar Chinnam A, Sreevani G. Synthesis of Phenanthroline and Indole Based Hybrid Cyclophane Derivatives via Ring-Closing Metathesis. HETEROCYCLES 2016. [DOI: 10.3987/com-15-s(t)18] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
24
|
Kotha S, Chinnam AK, Ali R. Hybrid macrocycle formation and spiro annulation on cis-syn-cis-tricyclo[6.3.0.0(2,6)]undeca-3,11-dione and its congeners via ring-closing metathesis. Beilstein J Org Chem 2015. [PMID: 26199668 PMCID: PMC4505178 DOI: 10.3762/bjoc.11.126] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
We have developed a simple methodology to transform cis-syn-cis-triquinane derivative 2 into the diindole based macrocycle 6 involving Fischer indolization and ring-closing metathesis (RCM). Various spiro-polyquinane derivatives have been assembled via RCM as a key step.
Collapse
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai-400 076, India
| | - Ajay Kumar Chinnam
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai-400 076, India
| | - Rashid Ali
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai-400 076, India
| |
Collapse
|
25
|
Horikoshi S, Watanabe T, Kamata M, Suzuki Y, Serpone N. Microwave-assisted organic syntheses: microwave effect on intramolecular reactions – the Claisen rearrangement of allylphenyl ether and 1-allyloxy-4-methoxybenzene. RSC Adv 2015. [DOI: 10.1039/c5ra18039b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
We examined the possible effect microwaves may have on intramolecular reactions such as the Claisen-type rearrangement process carried out in DMSO solvent and in solvent-free microwave irradiation conditions.
Collapse
Affiliation(s)
- Satoshi Horikoshi
- Department of Materials and Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Tomoki Watanabe
- Department of Materials and Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Momoko Kamata
- Department of Materials and Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Yumiko Suzuki
- Department of Materials and Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Nick Serpone
- PhotoGreen Laboratory
- Dipartimento di Chimica
- Universita di Pavia
- Pavia 27100
- Italy
| |
Collapse
|
26
|
Eshghi H. Ferric Hydrogensulfate Catalysed Schmidt Reaction of Ketones to Amides under Solvent-Free Conditions. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200600131] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
27
|
Kotha S, Misra S, Srinivas V. Diversity Oriented Approach to Polycyclic Compounds through the Diels-Alder Reaction and the Suzuki Coupling. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200484] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
28
|
Kotha S, Srinivas V, G. Krishna N. DIVERSITY ORIENTED APPROACH TO 9-ARYL-SUBSTITUTED NAPHTHOXEPINE DERIVATIVES VIA CLAISEN REARRANGEMENT, RING-CLOSING METATHESIS AND SUZUKI–MIYAURA CROSS-COUPLING AS KEY STEPS. HETEROCYCLES 2012. [DOI: 10.3987/com-12-s(n)89] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
29
|
Takabatake T, Takeuchi S, Saito H, Miyairi S. Molecular Sieves Catalyzed Synthesis of Phenazine 5,10-Dioxides under Solvent-Free Conditions Using Microwave Irradiation. HETEROCYCLES 2011. [DOI: 10.3987/com-10-12113] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
30
|
Yamamoto Y, Takuma R, Hotta T, Yamashita K. Synthesis of 2,5-Dihydrofuran-Fused Quinones from Ether-Tethered Diiododiyne. J Org Chem 2009; 74:4324-8. [DOI: 10.1021/jo9005975] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yoshihiko Yamamoto
- Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Ryousuke Takuma
- Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Tomitaka Hotta
- Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Ken Yamashita
- Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| |
Collapse
|
31
|
Dadush E, Green JF, Sease A, Naravane A, Pagni RM, Kabalka GW. Microwave Activation of Alumina and its use as a Catalyst in Synthetic Reactions. JOURNAL OF CHEMICAL RESEARCH 2009. [DOI: 10.3184/030823409x401790] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Microwave irradiation is a simple and efficient method of activating gamma alumina. Alumina activated in this manner is an excellent medium in which to carry out the Diels–Alder reaction and, in conjunction with additional microwave irradiation, the Claisen rearrangement. Several 2-allylphenols formed in the Claisen rearrangement rapidly undergo ring closure on alumina to form dihydrobenzofurans demonstrating the Brønsted acidity of the solid.
Collapse
Affiliation(s)
- Eric Dadush
- Departments of Chemistry and Radiology, University of Tennessee, Knoxville, TN 37996, USA
| | - James F. Green
- Departments of Chemistry and Radiology, University of Tennessee, Knoxville, TN 37996, USA
| | | | - Abhijit Naravane
- Departments of Chemistry and Radiology, University of Tennessee, Knoxville, TN 37996, USA
| | - Richard M. Pagni
- Departments of Chemistry and Radiology, University of Tennessee, Knoxville, TN 37996, USA
| | - George W. Kabalka
- Departments of Chemistry and Radiology, University of Tennessee, Knoxville, TN 37996, USA
| |
Collapse
|
32
|
Takabatake T, Sumiyoshi Y, Saito H, Miyairi S. Silica Gel Catalyzed Synthesis of Quinoxaline 1,4-Dioxides under Solvent-Free Conditions Using Microwave Irradiation. HETEROCYCLES 2009. [DOI: 10.3987/com-08-11588] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
33
|
Bowman MD, Schmink JR, McGowan CM, Kormos CM, Leadbeater NE. Scale-Up of Microwave-Promoted Reactions to the Multigram Level Using a Sealed-Vessel Microwave Apparatus. Org Process Res Dev 2008. [DOI: 10.1021/op8001239] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Matthew D. Bowman
- Department of Chemistry, University of Connecticut, Unit 3060, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, U.S.A., and Department of Chemistry, Merrimack College, 315 Turnpike Street, North Andover, Massachusetts 01845, U.S.A
| | - Jason R. Schmink
- Department of Chemistry, University of Connecticut, Unit 3060, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, U.S.A., and Department of Chemistry, Merrimack College, 315 Turnpike Street, North Andover, Massachusetts 01845, U.S.A
| | - Cynthia M. McGowan
- Department of Chemistry, University of Connecticut, Unit 3060, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, U.S.A., and Department of Chemistry, Merrimack College, 315 Turnpike Street, North Andover, Massachusetts 01845, U.S.A
| | - Chad M. Kormos
- Department of Chemistry, University of Connecticut, Unit 3060, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, U.S.A., and Department of Chemistry, Merrimack College, 315 Turnpike Street, North Andover, Massachusetts 01845, U.S.A
| | - Nicholas E. Leadbeater
- Department of Chemistry, University of Connecticut, Unit 3060, 55 North Eagleville Road, Storrs, Connecticut 06269-3060, U.S.A., and Department of Chemistry, Merrimack College, 315 Turnpike Street, North Andover, Massachusetts 01845, U.S.A
| |
Collapse
|
34
|
Guillonneau L, Taddei D, Moody CJ. Synthesis of the Reported Structure of the Bisbenzoquinone Lanciaquinone, Isolated from Maesa lanceolata. Org Lett 2008; 10:4505-8. [DOI: 10.1021/ol801697g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Loic Guillonneau
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - David Taddei
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Christopher J. Moody
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| |
Collapse
|
35
|
|
36
|
McErlean CSP, Moody CJ. First Synthesis of N-(3-Carboxylpropyl)-5-amino-2-hydroxy-3- tridecyl-1,4-benzoquinone, an Unusual Quinone Isolated from Embelia ribes. J Org Chem 2007; 72:10298-301. [DOI: 10.1021/jo702101w] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Christopher J. Moody
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| |
Collapse
|
37
|
Lin YL, Cheng JY, Chu YH. Microwave-accelerated Claisen rearrangement in bicyclic imidazolium [b-3C-im][NTf2] ionic liquid. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.08.060] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
38
|
Kotha S, Dipak MK. Design and synthesis of novel propellanes by using claisen rearrangement and ring-closing metathesis as the key steps. Chemistry 2007; 12:4446-50. [PMID: 16568489 DOI: 10.1002/chem.200501366] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Novel hexacyclic caged compounds are prepared by a combination of Claisen rearrangement and ring-closing metathesis (RCM). Additionally, a Grignard reaction in conjugation with RCM produced intricate hexacyclic caged molecules.
Collapse
|
39
|
McErlean CSP, Proisy N, Davis CJ, Boland NA, Sharp SY, Boxall K, Slawin AMZ, Workman P, Moody CJ. Synthetic ansamycins prepared by a ring-expanding Claisen rearrangement. Synthesis and biological evaluation of ring and conformational analogues of the Hsp90 molecular chaperone inhibitor geldanamycin. Org Biomol Chem 2007; 5:531-46. [PMID: 17252137 DOI: 10.1039/b615378j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A series of ansa-quinones has been prepared by chemical synthesis, and evaluated by biological techniques. Thus, 19-membered ansa-lactams, simplified analogues of the naturally occurring Hsp90 molecular chaperone inhibitor geldanamycin, were obtained by concise routes, the key steps being the combination of a ring-closing metathesis to give a 17-membered ring followed by Claisen rearrangement to effect ring expansion. The methodology was also used to prepare an "unnatural" 18-membered ring analogue. In ATPase enzyme assays, the synthetic ansa-quinones were weak inhibitors of Hsp90.
Collapse
|
40
|
Kotha S, Mandal K, Tiwari A, Mobin SM. Diversity-Oriented Approach to Biologically Relevant Molecular Frameworks Starting with β-Naphthol and Using the Claisen Rearrangement and Olefin Metathesis as Key Steps. Chemistry 2006; 12:8024-38. [PMID: 16983708 DOI: 10.1002/chem.200600540] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A diversity-oriented approach for the synthesis of various structurally different molecular frameworks from readily accessible and common precursors is described. A Claisen rearrangement followed by ring-closing metathesis or ethylene-promoted ring-closing enyne metathesis has been utilized as the key synthetic transformation to generate naphthoxepine derivatives. The ring-closing metathesis approach has also been used to generate spirocyclic compounds and the pleiadene framework.
Collapse
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology, Bombay, Powai, Mumbai-400 076, India.
| | | | | | | |
Collapse
|
41
|
|
42
|
Jacob AM, Moody CJ. Microwave-assisted combined Mitsunobu reaction–Claisen rearrangement and microwave-assisted phenol oxidation: rapid synthesis of 2,6-disubstituted-1,4-benzoquinone natural products. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.10.096] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
43
|
Mihara M, Ito T, Ishino Y, Oderaotoshi Y, Minakata S, Komatsu M. Silica gel-promoted synthesis of 3,4,5-triaryltetrahydro-1,4-thiazine derivatives from β,β′-dichloro sulfides and aromatic amines. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.09.119] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
44
|
Schobert R, Urbina-González JM. Annulated butanolides by ring closing metathesis of diallyltetronic acid derivatives. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.03.152] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
45
|
Kotha S, Deb AC, Kumar RV. Spiro-annulation of barbituric acid derivatives and its analogs by ring-closing metathesis reaction. Bioorg Med Chem Lett 2005; 15:1039-43. [PMID: 15686908 DOI: 10.1016/j.bmcl.2004.12.034] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2004] [Revised: 12/10/2004] [Accepted: 12/11/2004] [Indexed: 10/25/2022]
Abstract
Barbituric acid 1 and related beta-dicarbonyl compounds were dialkenylated under the phase-transfer catalyst [e.g., benzyltriethylammonium chloride (BTEAC)] conditions to generate the diallylated products. These diallylated products were subjected to the ring-closing metathesis (RCM) reaction to deliver the corresponding spiro-annulated derivatives.
Collapse
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
| | | | | |
Collapse
|