scholarly journals First Total Syntheses of (±)-Isopiline, (±)-Preocoteine, (±)-Oureguattidine and (±)-3-Methoxynordomesticine and the Biological Activities of (±)-3-Methoxynordomesticine

2009 ◽  
Vol 57 (4) ◽  
pp. 368-376 ◽  
Author(s):  
Surachai Nimgirawath ◽  
Phansuang Udomputtimekakul ◽  
Thongchai Taechowisan ◽  
Asawin Wanbanjob ◽  
Yuemao Shen
Keyword(s):  
Biological Activities ◽  
Total Syntheses

scholarly journals Synthesis and Biological Activities of Cyclodepsipeptides of Aurilide Family from Marine Origin

Marine Drugs ◽  
2021 ◽  
Vol 19 (2) ◽  
pp. 55
Author(s):  
Synthia Michon ◽  
Florine Cavelier ◽  
Xavier J. Salom-Roig
Keyword(s):  
Cell Lines ◽  
Cancer Cell ◽  
Biological Activities ◽  
Natural Compounds ◽  
Cancer Cell Lines ◽  
Hydroxy Ester ◽  
Marine Cyanobacteria ◽  
Synthetic Analogues ◽  
Marine Origin ◽  
Total Syntheses

Aurilides are a class of depsipeptides occurring mainly in marine cyanobacteria. Members of the aurilide family have shown to exhibit strong cytotoxicity against various cancer cell lines. These compounds bear a pentapeptide, a polyketide, and an α-hydroxy ester subunit in their structure. A large number of remarkable studies on aurilides have emerged since 1996. This comprehensive account summarizes the biological activities and total syntheses of natural compounds of the aurilide family as well as their synthetic analogues.

scholarly journals Xylochemical Synthesis and Biological Evaluation of Shancigusin C and Bletistrin G

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3224
Author(s):  
Leander Geske ◽  
Ulrich Kauhl ◽  
Mohamed E. M. Saeed ◽  
Anja Schüffler ◽  
Eckhard Thines ◽  
...  
Keyword(s):  
Total Synthesis ◽  
Biological Activities ◽  
Biological Evaluation ◽  
Aromatic Substitution ◽  
Substitution Reactions ◽  
Total Syntheses ◽  
Wittig Olefination ◽  
Starting Point ◽  
Perkin Reaction ◽  
Synthesis And Biological Evaluation

The biological activities of shancigusin C (1) and bletistrin G (2), natural products isolated from orchids, are reported along with their first total syntheses. The total synthesis of shancigusin C (1) was conducted by employing the Perkin reaction to forge the central stilbene core, whereas the synthesis of bletistrin G (2) was achieved by the Wittig olefination followed by several regioselective aromatic substitution reactions. Both syntheses were completed by applying only renewable starting materials according to the principles of xylochemistry. The cytotoxic properties of shancigusin C (1) and bletistrin G (2) against tumor cells suggest suitability as a starting point for further structural variation.

scholarly journals Oxazolidinones as Chiral Auxiliaries in the Asymmetric 1,4-Conjugate Addition Reaction Applied to the Total Synthesis of Natural Products: A Supplemental Mini-Review

2018 ◽  
Vol 15 (1) ◽  
pp. 3-20 ◽  
Author(s):  
Vahideh Zadsirjan ◽  
Majid M. Heravi
Keyword(s):  
Total Synthesis ◽  
Biological Activities ◽  
Conjugate Addition ◽  
Chiral Auxiliary ◽  
Addition Reactions ◽  
Chiral Auxiliaries ◽  
Complex Molecules ◽  
Total Syntheses ◽  
Naturally Occurring ◽  
Wide Range

Background: The most frequently used chiral auxiliaries, oxazolidinones (Evans' oxazolidinones) have been employed in 1,4-congugate addition reactions to α,β-unsaturated carbonyl compounds. Supplementary to our previous reports in this mini-review, we attempted to underscore the applications of this strategy in a step (steps) in the total synthesis of some naturally occurring compounds exhibiting diverse biological activities. Objective: In this mini-review, we try to underscore the applications of oxazolidinones (Evans’ oxazolidinones) in 1,4-congugate addition reactions to α,β-unsaturated carbonyl in the total synthesis of some naturally occurring compounds exhibiting diverse biological activities. Conclusion: In spite of well-known superiority of asymmetric catalyzed reactions, the use of auxiliarycontrolled reactions are still considered as commanding, vital and sometimes as only tools in the generation of stereogenic centers during the construction of complex molecules and total synthesis of naturally occurring compounds. The commercial availability, or readily accessibility of a wide variety of chiral amino alcohols as starting materials to synthesize a wide range of oxazolidinones is the merits of them. In addition, the ease of removal and subjection to various and diverse stereoselective reactions make oxazolidinones as the ideal and superior chiral auxiliaries. In this regard, they were successfully used in asymmetric 1,4-conjugate addition reactions with high stereoselectivities. The high degree of asymmetric induction can be attributed to the rigid chelation of N-acyloxazolidinones with metal ions, as well as the covering of one face of the system by the bulkiness of 4-substituent. In summary, in this report, the importance of the applications of chiral oxazolidinones as suitable chiral auxiliaries in the stereoselective, 1,4-conjugate addition reactions in asymmetric synthesis and in particular, the total synthesis of naturally occurring compounds and some complex molecules were underscored. Noticeably, in these total syntheses, this chiral auxiliary is controlling the stereochemistry of a newly created stereogenic center as well as preserving the configuration of other chiral centers, which already have been presented in the precursor. General methods have been established for the attachment of the chiral auxiliary as a moiety to the substrate molecule in high to excellent yields. At the end of these reactions, this auxiliary can be easily removed leaving various desired reactive motifs for the next step in multi-step synthesis.

Cofactor-Independent Pinacolase Directs Non-Diels-Alderase Biogenesis of the Brevianamides

2019 ◽  
Author(s):  
Ying Ye ◽  
Lei Du ◽  
Xingwang Zhang ◽  
Sean A. Newmister ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Biochemical Analysis ◽  
Mutational Analysis ◽  
Biological Activities ◽  
Wide Spectrum ◽  
Biosynthetic Gene Cluster ◽  
Diels Alder ◽  
Total Syntheses ◽  
Targeted Gene Disruption ◽  
Pinacol Rearrangement

<p>Fungal bicyclo[2.2.2]diazaoctane indole alkaloids demonstrate intriguing structures and a wide spectrum of biological activities. Although biomimetic total syntheses have been completed for representative compounds of this structural family, the details of their biogenesis have remained largely uncharacterized. Among them, Brevianamide A represents the most basic form within this class bearing a dioxopiperazine core structure and a rare 3-<i>spiro</i>-<i>psi</i>-indoxyl skeleton. Here, we identified the Brevianamide A biosynthetic gene cluster from <i>Penicillium brevicompacticum</i> NRRL 864 and fully elucidated the metabolic pathway by targeted gene disruption, heterologous expression, precursor incorporation studies, and <i>in vitro</i> biochemical analysis. In particular, we determined that BvnE is a cofactor-independent isomerase that is essential for selective production of Brevianamide A. Based on a high resolution crystal structure of BvnE, molecular modeling, mutational analysis, and computational studies provided new mechanistic insights into the diastereoselective formation of the 3-<i>spiro</i>-<i>psi</i>-indoxyl moiety in Brevianamide A. This occurs through a biocatalyst controlled semi-Pinacol rearrangement and a subsequent spontaneous intramolecular [4+2] <i>hetero</i>-Diels-Alder cycloaddition.</p>

scholarly journals Synthesis of tryptophan-containing 2,5-diketopiperazines via sequential C–H activation: total syntheses of tryprostatin A, maremycins A and B

2021 ◽  
Vol 12 (39) ◽  
pp. 13137-13143
Author(s):  
Xue-Song Yin ◽  
Wei-Yi Qi ◽  
Bing-Feng Shi
Keyword(s):  
Biological Activities ◽  
Cyclic Dipeptides ◽  
Total Syntheses ◽  
Important Type

Indole 2,5-diketopiperazines (DKPs) are an important type of metabolic cyclic dipeptides containing a tryptophan (Trp) unit possessing a range of interesting biological activities.

scholarly journals Structures, Biological Activities and Total Syntheses of Cyclic Bisbibenzyls from Liverworts.

2000 ◽  
Vol 58 (7) ◽  
pp. 654-665 ◽  
Author(s):  
Yoshiyasu Fukuyama ◽  
Mitsuaki Kodama ◽  
Yoshinori Asakawa
Keyword(s):  
Biological Activities ◽  
Total Syntheses

Total synthesis of bryostatin 3

Science ◽  
2020 ◽  
Vol 368 (6494) ◽  
pp. 1007-1011 ◽  
Author(s):  
Barry M. Trost ◽  
Youliang Wang ◽  
Andreas K. Buckl ◽  
Zhongxing Huang ◽  
Minh H. Nguyen ◽  
...  
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Marine Natural Products ◽  
Biological Activities ◽  
Step Count ◽  
Total Syntheses ◽  
Linear Sequence ◽  
Wide Range

Bryostatins are a family of 21 complex marine natural products with a wide range of potent biological activities. Among all the 21 bryostatins, bryostatin 3 is structurally the most complex. Whereas nine total syntheses of bryostatins have been achieved to date, bryostatin 3 has only been targeted once and required the highest number of steps to synthesize (43 steps in the longest linear sequence and 88 total steps). Here, we report a concise total synthesis of bryostatin 3 using 22 steps in the longest linear sequence and 31 total steps through a highly convergent synthetic plan by the use of highly atom-economical and chemoselective transformations in which alkynes played a major role in reducing step count.

scholarly journals A review of the total syntheses of triptolide

2019 ◽  
Vol 15 ◽  
pp. 1984-1995 ◽  
Author(s):  
Xiang Zhang ◽  
Zaozao Xiao ◽  
Hongtao Xu
Keyword(s):  
Organic Chemistry ◽  
Natural Product ◽  
Medicinal Chemistry ◽  
Biological Activities ◽  
Structural Features ◽  
Total Syntheses ◽  
Future Studies

Triptolide is a complex triepoxide diterpene natural product that has attracted considerable interest in the organic chemistry and medicinal chemistry societies due to its intriguing structural features and multiple promising biological activities. In this review, progress in the total syntheses of triptolide are systematically summarized. We hope to gain a better understanding of the field and provide constructive suggestions for future studies of triptolide.

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