scholarly journals Concise and Gram-Scale Total Synthesis of Lansiumamides A and B and Alatamide

Molecules ◽  
2019 ◽  
Vol 24 (20) ◽  
pp. 3764
Author(s):  
Ran Lin ◽  
Xi Lin ◽  
Qian Su ◽  
Binbin Guo ◽  
Yanqin Huang ◽  
...  
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Synthetic Strategy

The total synthesis of potent anti-obesity lansiumamide B was accomplished in four steps using commercially available materials. The synthetic strategy, featured with copper-catalyzed Buchwald coupling, is concise, convergent, practical and can be carried out on a one-gram scale. This approach could give either Z- or E-configured enamide moiety in natural products with absolute stereocontrol and was applied in the total synthesis of natural products.

scholarly journals Development of a Divergent Route to Erythrina Alkaloids

Synlett ◽  
2020 ◽  
Vol 31 (04) ◽  
pp. 327-333 ◽  
Author(s):  
Jesper L. Kristensen ◽  
Sebastian Clementson ◽  
Mikkel Jessing ◽  
Paulo J. Vital
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
19Th Century ◽  
First Generation ◽  
Second Generation ◽  
Enantioselective Synthesis ◽  
Third Generation ◽  
Synthetic Strategy ◽  
Erythrina Alkaloids ◽  
The 19Th Century

Erythrina alkaloids were identified at the end of the 19th century and today, more than 100 members of the erythrinane family have been isolated. They are characterized by a unique tetracyclic, α-tertiary spiroamine scaffold. Herein we detail our efforts towards the development of a divergent enantioselective synthesis of (+)-dihydro-β-erythroidine (DHβE) – one of the most prominent members of this intriguing family of natural products.1 Introduction2 Synthetic Strategy2.1 First Generation2.2 Second Generation2.3 Third Generation2.3.1 Radical Endgame2.3.2 Completion of the Total Synthesis3 Conclusion

scholarly journals Synthesis of Highly Functionalised Furo[3,4-b]pyrans: Towards the Fungal Metabolite (−)-TAN-2483B

2021 ◽  
Author(s):  
◽  
R.M. Kalpani K. Somarathne
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Natural Product ◽  
Cyclopropane Ring ◽  
Ring Expansion ◽  
Ethyl Esters ◽  
Pyran Ring ◽  
Synthetic Strategy ◽  
Alternative Approach ◽  
Synthetic Approaches

<p>Carbohydrate-derived cyclopropanes combine both the stereochemical wealth of carbohydrates and the reactivity of cyclopropanes. A diverse variety of reaction modes for these cyclopropyl carbohydrates can be harnessed for the synthesis of natural products and other targets.  The natural products (−)-TAN-2483A and (−)-TAN-2483B are fungal secondary metabolites displaying a variety of bioactivities such as inhibition of c-src kinase action and parathyroid hormone-induced bone resorption. This thesis described several synthetic approaches to the natural product (−)-TAN-2483B and analogues of (−)-TAN-2483B employing cyclopropane ring expansion.  The synthetic route to (−)-TAN-2483B began with the readily available substrate D-mannose. The pyran ring unsaturation of the natural product was established by a cyclopropanation-ring expansion sequence. A synthetic strategy via dichlorocyclopropane-based intermediates is described in chapter 2. This being unsuccessful, an alternative approach via 2-fomyl-glycal was developed in chapter 3. The chapter 2 and 3 provided a solid background for the achievement of the analogues synthesis illustrated in chapter 4 via dibromocyclopropane. Lewis acid-mediated alkynylation followed by Pdcatalysed carbonylative lactonisation was successfully utilised in the revelation of the furo[3,4-b]pyran ring skeleton. This route afforded analogues of TAN-2483B; the Z-and E-unsaturated ethyl esters 140 and 141 and hydroxy(−)-TAN-2483B 145. The total synthesis of (−)-TAN-2483B was not achieved due to unforeseen obstacles encountered in the deoxygenation of the side arm of 335 (Chapter 4) into the E-propenyl side arm of (−)-TAN-2483B.</p>

The intramolecular Diels–Alder reaction: recent advances and synthetic applications

1984 ◽  
Vol 62 (2) ◽  
pp. 183-234 ◽  
Author(s):  
Alex G. Fallis
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Alder Reaction ◽  
Diels Alder ◽  
Synthetic Strategy ◽  
Diels Alder Reaction ◽  
Recent Advances ◽  
Cyclic Dienes

Recent advances and examples of the intramolecular Diels–Alder reaction are summarized and applications to the total synthesis of natural products, both completed and in progress, noted. A detailed discussion of trienes leading to bicyclo[4.3.0]nonene skeletons is followed by examples of bicyclo[4.4.0]decenes and adducts arising from ortho-quinodimethane precursors. Cycloadditions affording bicyclo[n.4.0] systems and bridged-ring adducts from cyclic dienes conclude this survey which is followed by a discussion of unreactive trienes and a brief analysis of synthetic strategy to complete the review.

scholarly journals Total Synthesis of the Natural Chalcone Lophirone E, Synthetic Studies toward Benzofuran and Indole-Based Analogues, and Investigation of Anti-Leishmanial Activity

Molecules ◽  
2022 ◽  
Vol 27 (2) ◽  
pp. 463
Author(s):  
Luca Pozzetti ◽  
Roberta Ibba ◽  
Sara Rossi ◽  
Orazio Taglialatela-Scafati ◽  
Donatella Taramelli ◽  
...  
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Leishmania Infantum ◽  
Anticancer Properties ◽  
Synthetic Strategy ◽  
Pathological Conditions ◽  
Structure Activity ◽  
Small Set ◽  
Synthetic Approaches ◽  
Therapeutic Leads

The potential of natural and synthetic chalcones as therapeutic leads against different pathological conditions has been investigated for several years, and this class of compounds emerged as a privileged chemotype due to its interesting anti-inflammatory, antimicrobial, antiviral, and anticancer properties. The objective of our study was to contribute to the investigation of this class of natural products as anti-leishmanial agents. We aimed at investigating the structure–activity relationships of the natural chalcone lophirone E, characterized by the presence of benzofuran B-ring, and analogues on anti-leishmania activity. Here we describe an effective synthetic strategy for the preparation of the natural chalcone lophirone E and its application to the synthesis of a small set of chalcones bearing different substitution patterns at both the A and heterocyclic B rings. The resulting compounds were investigated for their activity against Leishmania infantum promastigotes disclosing derivatives 1 and 28a,b as those endowed with the most interesting activities (IC50 = 15.3, 27.2, 15.9 μM, respectively). The synthetic approaches here described and the early SAR investigations highlighted the potential of this class of compounds as antiparasitic hits, making this study worthy of further investigation.

scholarly journals Unified Total Synthesis of the Brevianamide Alkaloids Enabled by Chemical Investigations into their Biosynthesis.

2021 ◽  
Author(s):  
Robert C. Godfrey ◽  
Helen E. Jones ◽  
Nicholas J. Green ◽  
Andrew L. Lawrence
Keyword(s):  
Natural Products ◽  
Chemical Synthesis ◽  
Total Synthesis ◽  
Scientific Community ◽  
Biological Activities ◽  
Focus Of Attention ◽  
Complex Structures ◽  
Biosynthetic Pathways ◽  
Synthetic Strategy ◽  
Synthetic Studies

The bicyclo[2.2.2]diazaoctane alkaloids are a vast group of natural products which have been the focus of attention from the scientific community for several decades. This interest stems from their broad range of biological activities, their diverse biosynthetic origins, and their topologically complex structures, which combined make them enticing targets for chemical synthesis. In this article, full details of our synthetic studies into the chemical feasibility of a proposed network of biosynthetic pathways towards the brevianamide family of bicyclo[2.2.2]diazaoctane alkaloids are disclosed. Insights into issues of reactivity and selectivity in the biosynthesis of these structures have aided the development of a unified biomimetic synthetic strategy, which has resulted in the total synthesis of all known bicyclo[2.2.2]diazaoctane brevianamides and the anticipation of an as-yet-undiscovered congener.

scholarly journals Unified total synthesis of the natural products endiandric acid A, kingianic acid E, and kingianins A, D, and F

2015 ◽  
Vol 6 (7) ◽  
pp. 3886-3890 ◽  
Author(s):  
S. L. Drew ◽  
A. L. Lawrence ◽  
M. S. Sherburn
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Synthetic Strategy ◽  
Structural Types

A measure of the strength of a synthetic strategy is its versatility: specifically, whether it allows structurally distinct targets to be prepared. This work describes the total synthesis of natural products of three distinct structural types from a common intermediate.

Pursuit of Enantioselective Synthesis of Heterocycle-Bearing ­Stereocenters: The Development of a Stereocontrolled BINOL-­Catalyzed Conjugate Addition of Organoboron Nucleophiles

Synlett ◽  
2017 ◽  
Vol 28 (16) ◽  
pp. 2093-2109 ◽  
Author(s):  
Jeremy May ◽  
Thien Nguyen ◽  
Truong Nguyen ◽  
Phong Le ◽  
Po-An Chen ◽  
...  
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Functional Groups ◽  
Conjugate Addition ◽  
Enantioselective Synthesis ◽  
Mechanistic Studies ◽  
Synthetic Strategy ◽  
Iterative Development

This account chronicles the iterative development of an enantioselective conjugate addition of organoboron nucleophiles to α,β-unsaturated enones and enals catalyzed by BINOL derivatives. Beginning with a specific application of this transformation to the total synthesis of the flinderole alkaloids, the transformation progressed to encompass a much larger scope of heterocycle-substituted electrophiles. The next phase saw progress toward the use of a broader scope of functional nucleophiles, with application in a strategy to synthesize discoipyrrole D. At each stage of this chronologically organized discussion, key problems, hypotheses, and solutions are presented to show the sources of discovery and solutions to problems as the catalyst and other reaction components were made more reactive. The interplay of target-directed reaction development, efforts to increase the scope of compatible functional groups, mechanistic studies, and empirical exploration is described to illustrate sources of chemical discovery.1 Introduction2 Synthesis of the Flinderole Natural Products3 Indole-Bearing Stereocenters4 Heteroaryl-Bearing Stereocenters5 Bis-Heteroaryl Stereocenters6 Synthetic Strategy for Discoipyrrole D7 Bis-Aryl Stereocenters8 Remaining Challenges9 Conclusion

scholarly journals Synthesis of Highly Functionalised Furo[3,4-b]pyrans: Towards the Fungal Metabolite (−)-TAN-2483B

2021 ◽  
Author(s):  
◽  
R.M. Kalpani K. Somarathne
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Natural Product ◽  
Cyclopropane Ring ◽  
Ring Expansion ◽  
Ethyl Esters ◽  
Pyran Ring ◽  
Synthetic Strategy ◽  
Alternative Approach ◽  
Synthetic Approaches

<p>Carbohydrate-derived cyclopropanes combine both the stereochemical wealth of carbohydrates and the reactivity of cyclopropanes. A diverse variety of reaction modes for these cyclopropyl carbohydrates can be harnessed for the synthesis of natural products and other targets.  The natural products (−)-TAN-2483A and (−)-TAN-2483B are fungal secondary metabolites displaying a variety of bioactivities such as inhibition of c-src kinase action and parathyroid hormone-induced bone resorption. This thesis described several synthetic approaches to the natural product (−)-TAN-2483B and analogues of (−)-TAN-2483B employing cyclopropane ring expansion.  The synthetic route to (−)-TAN-2483B began with the readily available substrate D-mannose. The pyran ring unsaturation of the natural product was established by a cyclopropanation-ring expansion sequence. A synthetic strategy via dichlorocyclopropane-based intermediates is described in chapter 2. This being unsuccessful, an alternative approach via 2-fomyl-glycal was developed in chapter 3. The chapter 2 and 3 provided a solid background for the achievement of the analogues synthesis illustrated in chapter 4 via dibromocyclopropane. Lewis acid-mediated alkynylation followed by Pdcatalysed carbonylative lactonisation was successfully utilised in the revelation of the furo[3,4-b]pyran ring skeleton. This route afforded analogues of TAN-2483B; the Z-and E-unsaturated ethyl esters 140 and 141 and hydroxy(−)-TAN-2483B 145. The total synthesis of (−)-TAN-2483B was not achieved due to unforeseen obstacles encountered in the deoxygenation of the side arm of 335 (Chapter 4) into the E-propenyl side arm of (−)-TAN-2483B.</p>

Computationally Augmented Retrosynthesis: Total Synthesis of Paspaline A and Emindole PB

2018 ◽  
Author(s):  
Timothy Newhouse ◽  
Daria E. Kim ◽  
Joshua E. Zweig
Keyword(s):  
Chemical Synthesis ◽  
Total Synthesis ◽  
Small Molecules ◽  
First Principles ◽  
Quantum Chemical ◽  
Computational Analysis ◽  
Empirical Evaluation ◽  
Synthetic Strategy ◽  
Catalyzed Reactions ◽  
Enzyme Catalyzed Reactions

The diverse molecular architectures of terpene natural products are assembled by exquisite enzyme-catalyzed reactions. Successful recapitulation of these transformations using chemical synthesis is hard to predict from first principles and therefore challenging to execute. A means of evaluating the feasibility of such chemical reactions would greatly enable the development of concise syntheses of complex small molecules. Herein, we report the computational analysis of the energetic favorability of a key bio-inspired transformation, which we use to inform our synthetic strategy. This approach was applied to synthesize two constituents of the historically challenging indole diterpenoid class, resulting in a concise route to (–)-paspaline A in 9 steps from commercially available materials and the first pathway to and structural confirmation of emindole PB in 13 steps. This work highlights how traditional retrosynthetic design can be augmented with quantum chemical calculations to reveal energetically feasible synthetic disconnections, minimizing time-consuming and expensive empirical evaluation.

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