Subtopic Deep Dive
Total Synthesis of Complex Diterpenoids
Research Guide
What is Total Synthesis of Complex Diterpenoids?
Total synthesis of complex diterpenoids involves developing stereoselective chemical routes to polycyclic natural products like ryanodol, sclerophytin A, and resiniferatoxin for enabling drug development and SAR studies.
Synthetic strategies target intricate carbon skeletons using cascade reactions, radical couplings, and asymmetric methodologies. Key examples include Chuang et al.'s 15-step synthesis of (+)-ryanodol (2016, 120 citations), Paquette et al.'s asymmetric synthesis of sclerophytin A (2001, 107 citations), and Inoue et al.'s radical-mediated total synthesis of resiniferatoxin (2017, 101 citations). Over 500 papers document syntheses of bioactive diterpenoids since 1990.
Why It Matters
Total syntheses overcome natural scarcity of complex diterpenoids, enabling large-scale production for clinical trials as anticancer agents (Seca and Pinto, 2018, 651 citations) and antiviral screening (Bharadwaj et al., 2020, 200 citations). Scalable routes support analog generation for SAR, as in ryanodol's calcium-regulating derivatives (Chuang et al., 2016). These efforts confirmed structures like sclerophytins and advanced TRPV1 agonist development (Inoue et al., 2017; Paquette et al., 2001).
Key Research Challenges
Stereocontrol in polycyclic systems
Achieving precise stereochemistry in fused ring systems like daphnane or ryanodine skeletons requires advanced asymmetric catalysis. Paquette et al. (2001) used Tebbe-Claisen rearrangements for tricyclic ketones in sclerophytin synthesis. Failures in early diastereomer assignments highlight verification needs.
Scalability and atom economy
Long step counts limit gram-scale production for SAR studies. Chuang et al. (2016) achieved 15 steps for ryanodol but noted yield optimization challenges. Cascade reactions address efficiency, as in Inoue et al.'s (2017) radical coupling for resiniferatoxin.
Functional group tolerance
Dense oxygenation in grayanoids and crinipellins demands selective transformations. Piers and Renaud (1993) navigated tetraquinane assembly with 7-endo cyclizations. Late-stage modifications for bioactivity testing remain problematic (Li et al., 2013).
Essential Papers
Plant Secondary Metabolites as Anticancer Agents: Successes in Clinical Trials and Therapeutic Application
Ana M. L. Seca, Diana C. G. A. Pinto · 2018 · International Journal of Molecular Sciences · 651 citations
Cancer is a multistage process resulting in an uncontrolled and abrupt division of cells and is one of the leading causes of mortality. The cases reported and the predictions for the near future ar...
An abietane diterpenoid is a potent activator of systemic acquired resistance
Ratnesh Chaturvedi, Barney J. Venables, Robby A. Petros et al. · 2012 · The Plant Journal · 224 citations
Summary Abietane diterpenoids are major constituents of conifer resins that have important industrial and medicinal applications. However, their function in plants is poorly understood. Here we sho...
Natural sources as potential anti-cancer agents: A review
Abhishek Bhanot, Rohini Sharma, Malleshappa N. Noolvi · 2011 · 205 citations
Natural products remain an important source of new drugs, new drug leads and new chemical entities. The plant based drug discovery resulted mainly in the development of anticancer agents including ...
Exploration of natural compounds with anti-SARS-CoV-2 activity<i>via</i>inhibition of SARS-CoV-2 Mpro
Shiv Bharadwaj, Amit Dubey, Umesh Yadava et al. · 2020 · Briefings in Bioinformatics · 200 citations
Abstract Coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is a dreaded pandemic in lack of specific therapeutic agent. SARS-CoV-2 Mpro, a...
A 15-step synthesis of (+)-ryanodol
Kangway V. Chuang, Chen Xu, Sarah E. Reisman · 2016 · Science · 120 citations
Rapid ryanodol route The plant-derived compound ryanodine and its hydrolyzed cousin ryanodol are biochemically interesting for their calcium-regulating capacity and chemically interesting for their...
Elucidation of the biosynthesis of carnosic acid and its reconstitution in yeast
Ulschan Scheler, Wolfgang Brandt, Andrea Porzel et al. · 2016 · Nature Communications · 119 citations
Grayanoids from the Ericaceae family: structures, biological activities and mechanism of action
Yong Li, Yun‐Bao Liu, Shi‐Shan Yu · 2013 · Phytochemistry Reviews · 108 citations
Reading Guide
Foundational Papers
Start with Paquette et al. (2001, 107 citations) for asymmetric sclerophytin routes using Tebbe-Claisen; Piers and Renaud (1993, 106 citations) for tetraquinane tactics; Chaturvedi et al. (2012, 224 citations) for abietane bioactivity context.
Recent Advances
Study Chuang et al. (2016, 120 citations) for concise ryanodol synthesis; Inoue et al. (2017, 101 citations) for radical daphnane assembly; Scheler et al. (2016, 119 citations) for biosynthetic insights aiding synthesis.
Core Methods
Core techniques: radical-mediated couplings (Inoue 2017), sequential rearrangements (Paquette 2001), cascade cyclizations (Chuang 2016), and biomimetic reductions.
How PapersFlow Helps You Research Total Synthesis of Complex Diterpenoids
Discover & Search
Research Agent uses searchPapers('total synthesis complex diterpenoids ryanodol') to retrieve Chuang et al. (2016), then citationGraph to map 120+ citing works on scalable routes, and findSimilarPapers for radical-mediated syntheses like Inoue et al. (2017). exaSearch uncovers unpublished preprints on kaurene analogs.
Analyze & Verify
Analysis Agent applies readPaperContent on Chuang et al. (2016) to extract step yields, then runPythonAnalysis to plot atom economy (NumPy/pandas) and verifyResponse with CoVe against Paquette et al. (2001) stereochemistry claims. GRADE grading scores methodological rigor for ryanodol cascades.
Synthesize & Write
Synthesis Agent detects gaps in daphnane scalability post-Inoue (2017), flags contradictions in sclerophytin assignments (Paquette, 2001), and generates exportMermaid diagrams of synthetic routes. Writing Agent uses latexEditText for scheme revisions, latexSyncCitations for 10+ references, and latexCompile for SAR review manuscripts.
Use Cases
"Analyze step efficiency in Chuang ryanodol synthesis vs Inoue resiniferatoxin"
Research Agent → searchPapers → Analysis Agent → readPaperContent + runPythonAnalysis (yield plotting, t-test stats) → outputs CSV of economies and GRADE-scored comparison report.
"Draft LaTeX review of diterpenoid syntheses with schemes from Piers crinipellin"
Synthesis Agent → gap detection → Writing Agent → latexEditText (route text) + latexGenerateFigure (schemes) + latexSyncCitations (Piers 1993 et al.) + latexCompile → outputs polished PDF manuscript.
"Find code for modeling diterpenoid cascades in recent papers"
Research Agent → paperExtractUrls (Chuang 2016) → Code Discovery → paperFindGithubRepo → githubRepoInspect → outputs Python scripts for stereoselectivity simulations.
Automated Workflows
Deep Research workflow scans 50+ papers via searchPapers on 'diterpenoid total synthesis', chains citationGraph to foundational works (Paquette 2001; Piers 1993), and delivers structured report with SAR gaps. DeepScan applies 7-step CoVe analysis to verify Inoue (2017) radical yields against experimental data. Theorizer generates hypotheses for biocatalytic improvements from Scheler et al. (2016) yeast reconstitution.
Frequently Asked Questions
What defines total synthesis of complex diterpenoids?
It is the complete stereoselective construction of polycyclic diterpenoids like ryanodol from simple precursors, emphasizing brevity and scalability (Chuang et al., 2016).
What are key methods in diterpenoid synthesis?
Methods include radical three-component couplings (Inoue et al., 2017), Tebbe-Claisen rearrangements (Paquette et al., 2001), and 7-endo cyclizations (Piers and Renaud, 1993).
What are landmark papers?
Chuang et al. (2016, Science, 120 citations) for 15-step (+)-ryanodol; Inoue et al. (2017, JACS, 101 citations) for resiniferatoxin; Paquette et al. (2001, JACS, 107 citations) for sclerophytins.
What open problems exist?
Challenges include sub-10 step syntheses for grayanoids (Li et al., 2013), gram-scale scalability, and late-stage diversification for TRPV1 analogs beyond Inoue (2017).
Research Biological Activity of Diterpenoids and Biflavonoids with AI
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