Subtopic Deep Dive
Sultam Synthesis
Research Guide
What is Sultam Synthesis?
Sultam synthesis encompasses chemical methods to construct sultams, which are cyclic sulfonamides, with emphasis on asymmetric routes and their roles as chiral auxiliaries in stereoselective reactions.
Key approaches include Oppolzer's bornane sultam-directed aldol reactions (Oppolzer et al., 1990, 238 citations) and Pd-catalyzed hydrogenation of cyclic imines (Yu et al., 2009, 108 citations). Reviews cover fused sultams (Majumdar and Mondal, 2011, 208 citations) and recent methodologies like Cu-catalyzed carboamination (Kaneko et al., 2013, 99 citations). Over 10 seminal papers span from 1990 to 2018.
Why It Matters
Sultams serve as chiral auxiliaries enabling diastereomerically pure syn aldols in Oppolzer et al. (1990), critical for total synthesis of complex molecules. Fused sultams from Majumdar and Mondal (2011) find applications in medicinal chemistry scaffolds. Asymmetric hydrogenation by Yu et al. (2009) and carboamination by Kaneko et al. (2013) support enantioselective production of bioactive sulfonamides used in pharmaceuticals.
Key Research Challenges
Achieving High Enantioselectivity
Stereocontrol in sultam formation remains challenging, especially for diverse ring sizes beyond six-membered systems. Yu et al. (2009) achieved high ee via Pd/(S,S)-f-Binaphane catalysis on cyclic imines, but substrate scope limitations persist. Oppolzer et al. (1990) relied on bornane sultam auxiliaries for diastereoselection, requiring counterion tuning.
Expanding Ring Size Diversity
Synthesizing δ-sultams and β-sultams demands novel cyclization strategies like RCM. Jiménez-Hopkins and Hanson (2008) used ring-closing metathesis for stereodiverse δ-sultams with multiple handles. Zajac and Peters (2009) developed organocatalytic [2+2]-cycloadditions for β-sultams as taurine precursors.
Scaling Synthetic Routes
Transitioning lab-scale methods to multi-gram production faces efficiency hurdles. Ullah et al. (2010) scaled bromo- and fluoro-benzofused sultams using microwave-assisted continuous flow. Majumdar and Mondal (2011) reviewed fused sultam syntheses needing broader scalability.
Essential Papers
Bornane sultam-directed asymmetric synthesis of crystalline, enantiomerically pure syn aldols
Wolfgang Oppolzer, Julian Blagg, Inés Rodríguez et al. · 1990 · Journal of the American Chemical Society · 238 citations
N-acylsultams 2 furnish, via aldolization of their enolates 16 with aldehydes, diastereomerically pure, crystalline syn aldols. The absolute configuration of the product is controlled by the choice...
Recent Developments in the Synthesis of Fused Sultams
K. C. Majumdar, Shovan Mondal · 2011 · Chemical Reviews · 208 citations
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTRecent Developments in the Synthesis of Fused SultamsK. C. Majumdar*†‡ and Shovan Mondal†View Author Information† Department of Chemistry, University of K...
Sultams: Recent Syntheses and Applications
Sudarshan Debnath, Shovan Mondal · 2018 · European Journal of Organic Chemistry · 108 citations
Sultams are very important scaffolds both in medicinal chemistry and in synthetic organic chemistry. Very important methodologies for the asymmetric and non‐asymmetric synthesis of sultams, includi...
Highly Enantioselective Synthesis of Sultams via Pd-Catalyzed Hydrogenation
Chang‐Bin Yu, Dawei Wang, Yong‐Gui Zhou · 2009 · The Journal of Organic Chemistry · 108 citations
Using pd(cf(3)co(2))2/(S,S)-f-Binaphane as the catalyst, an efficient enantioselective synthesis of sultams was developed via asymmetric hydrogenation of the corresponding cyclic imines with high e...
Sultam Synthesis via Cu-Catalyzed Intermolecular Carboamination of Alkenes with <i>N</i>-Fluorobenzenesulfonimide
Keiichi Kaneko, Tatsuhiko Yoshino, Shigeki Matsunaga et al. · 2013 · Organic Letters · 99 citations
Cu-catalyzed intermolecular carboamination of alkenes is described. The reaction of terminal alkenes and an internal alkene with N-fluorobenzenesulfonimide was promoted by 2.5 mol % of a Cu(I)-salt...
An RCM Strategy to Stereodiverse δ-Sultam Scaffolds
María Jiménez-Hopkins, Paul R. Hanson · 2008 · Organic Letters · 87 citations
An asymmetric approach for the synthesis of substituted delta-sultams with multiple synthetic handles is described. This study demonstrates the facile construction of a stereochemically diverse arr...
Asymmetric Synthesis of α‐Amino Acids and α‐<i>N</i>‐Hydroxyamino Acids from <i>N</i>‐Acylbornane‐10,2‐sultams: 1‐chloro‐1‐nitrosocyclohexane as a practical [NH] equivalent
Wolfgang Oppolzer, Osamu Tamura, Jörg Deerberg · 1992 · Helvetica Chimica Acta · 86 citations
Abstract Successive treatment of N ‐acylsultams 3 with sodium hexamethyldisilazide, 1‐chloro‐1‐nitrosocyclohexane ( 1 ), and aq. HCl gave diastereoisomerically pure, crystalline N ‐hydroxyamino‐aci...
Reading Guide
Foundational Papers
Start with Oppolzer et al. (1990, 238 citations) for bornane sultam aldol basics and Majumdar and Mondal (2011, 208 citations) review for fused sultam overview, as they establish core asymmetric principles and synthetic diversity.
Recent Advances
Study Debnath and Mondal (2018, 108 citations) for memory-of-chirality advances and Ullah et al. (2010, 69 citations) for scalable flow synthesis.
Core Methods
Core techniques: auxiliary-directed aldolization (Oppolzer 1990), metal-catalyzed hydrogenations (Yu 2009), carboaminations (Kaneko 2013), organocatalytic cycloadditions (Zajac 2009), and RCM (Jiménez-Hopkins 2008).
How PapersFlow Helps You Research Sultam Synthesis
Discover & Search
Research Agent uses searchPapers and citationGraph to map Oppolzer et al. (1990, 238 citations) as the central node linking to 200+ aldol and sultam works, while exaSearch uncovers recent asymmetric variants and findSimilarPapers reveals Cu-carboamination parallels from Kaneko et al. (2013).
Analyze & Verify
Analysis Agent employs readPaperContent on Majumdar and Mondal (2011) review to extract fused sultam routes, verifies stereoselectivity claims via verifyResponse (CoVe) against Yu et al. (2009) ee data, and runs PythonAnalysis to plot citation trends or reaction yield distributions with GRADE scoring for methodological rigor.
Synthesize & Write
Synthesis Agent detects gaps in scalable δ-sultam methods post-Jiménez-Hopkins and Hanson (2008), flags contradictions in ring-closing strategies; Writing Agent uses latexEditText for reaction scheme revisions, latexSyncCitations to integrate 10 key papers, and latexCompile for publication-ready reviews with exportMermaid for stereodivergent pathway diagrams.
Use Cases
"Analyze stereoselectivity data from Pd-catalyzed sultam hydrogenation papers"
Research Agent → searchPapers('Pd hydrogenation sultams') → Analysis Agent → readPaperContent(Yu 2009) → runPythonAnalysis(ee yields pandas plot) → matplotlib yield-enantioselectivity graph with statistical verification.
"Draft a review section on RCM strategies for δ-sultams with citations"
Research Agent → citationGraph('Jiménez-Hopkins Hanson 2008') → Synthesis Agent → gap detection → Writing Agent → latexEditText(draft) → latexSyncCitations(5 related papers) → latexCompile → camera-ready LaTeX section.
"Find open-source code for microwave-assisted sultam synthesis simulations"
Research Agent → paperExtractUrls(Ullah 2010) → Code Discovery → paperFindGithubRepo → githubRepoInspect → verified Python scripts for MACOS yield optimization.
Automated Workflows
Deep Research workflow scans 50+ sultam papers via searchPapers → citationGraph, generating structured reports ranking methods by citations like Oppolzer (1990). DeepScan applies 7-step CoVe analysis to verify asymmetric hydrogenation claims from Yu (2009) with GRADE checkpoints. Theorizer hypothesizes novel Cu-Pd hybrid catalysts from Kaneko (2013) and Yu (2009) patterns.
Frequently Asked Questions
What defines sultam synthesis?
Sultam synthesis constructs cyclic sulfonamides, focusing on asymmetric methods using chiral auxiliaries like bornane sultams (Oppolzer et al., 1990).
What are key methods in sultam synthesis?
Prominent methods include Pd-catalyzed hydrogenation of imines (Yu et al., 2009), Cu-catalyzed carboamination (Kaneko et al., 2013), and RCM for δ-sultams (Jiménez-Hopkins and Hanson, 2008).
What are the most cited papers?
Top papers are Oppolzer et al. (1990, 238 citations) on aldol reactions, Majumdar and Mondal (2011, 208 citations) review on fused sultams, and Yu et al. (2009, 108 citations) on hydrogenation.
What open problems exist in sultam synthesis?
Challenges include broad enantioselective routes for non-six-membered rings and scalable continuous flow processes beyond Ullah et al. (2010) MACOS examples.
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