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Showing 1 to 20 of 60 for “"Diels-Alder reactions"”.
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Asymmetric intramolecular Diels-Alder reactions
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1986.
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Intramolecular Diels-Alder reactions of conformationally restricted systems
… studying the respective thermal Intramolecular Diels-Alder (IMDA) properties. It was envisaged that the diene and dienophile would be linked via a conformationally restricted spacer, trans-cyc1ohexane-l,2-dicarboxylic acid anhydride.
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Diels-Alder Reactions of 5-[Methoxypoly(Oxyethylene)]-(3E)-1,3-Pentadiene
… and 5-methoxyethoxy-(3E)-1,3-pentadiene (Ib). Diels-Alder reactions of Ia and Ib with acrolein, maleic anhydride, and diethyl acetylenedicarboxylate have been performed. The products of these reactions have been analyzed by spectroscopic techniques. The Diels-Alder adducts of Ia with maleic …
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Diels-Alder reactions of organotin acetylides and the chemistry of the adducts
Thesis: Ph. D., Massachusetts Institute of Technology. Dept. of Chemistry, 1966.
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Enantioselective (Formal) Aza-Diels-Alder Reactions with Danishefsky's Diene and Non-Danishefsky Type Dienes
… to develop enantioselective diene-imine (aza-Diels-Alder) reactions to efficiently access these substructures have increased. We have developed highly enantioselective silicon Lewis acid mediated formal aza-Diels-Alder reactions with Danishefsky's diene and non-Danishefsky's dienes to generate …
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Triplex Diels-Alder reactions of beta-methylstyrenes. Density functional investigation of pion-pion interactions
… (triplex) and is therefore called the triplex Diels-Alder reaction. Evidence is presented demonstrating the ability of this process to catalyze the additions of acyclic dienophiles to a cyclic diene. Furthermore, this reaction is found to occur with a high degree of syn stereospecificity.
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Diels -Alder reactions of [60]fullerene with 1,2,4,5-tetrazines and additions to [60]fullerene-tetrazine monoadducts
<p>The Diels-Alder reaction between [60]fullerene and 1,2,4,5-tetrazines was studied. Under conditions of total darkness, [60]fullerene reacts with tetrazines to form bicyclic intermediates which immediately extrudes nitrogen to yield C2nu symmetric monoadducts. Thus, 3,6-diphenyl and 3,6-di-(2 …
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Part One: Radical Cation and Triplex Diels-Alder Reactions. Part Two: Photochemistry of Tri-1-Naphthylboron
Part One. The Diels-Alder reactions of electron-rich alkenes and alkadienes in a photochemical electron transfer system are presented. In acetonitrile, the Diels-Alder dimerization of 1,3-cyclohexadiene (1) is shown to be the result of the reaction of the radical cation of 1. A chain mechanism and …
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Synthesis of pyridines and azaindoles via Diels-Alder reactions of tosyl cyanide with vinyl- and heteroarylallenes
… substituted pyridines and azaindoles involving Diels-Alder reactions of vinyl- and heteroarylallenes with tosyl cyanide. The synthetic elaboration of the various pyridine products via an ipso substitution strategy is also described. Part II of this thesis describes the optimization and scale-up …
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Nickel-catalyzed Suzuki-Miyaura reactions of unactivated halides with alkyl boranes and planar-chiral borabenzene catalysts for Diels-Alder reactions
… groups for the asymmetric Suzuki-Miyaura reactions halides. ... Part II details work towards an asymmetric Diels-Alder reaction between cyclopentadiene and methacrolein catalyzed by a planar-chiral boron Lewis acid. This system exhibits a level of turnover that is unprecedented in …
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Multicomponent Diels-Alder Sequences of 1-Aminodendralenes
… in multicomponent diene-transmissive Diels-Alder (DTDA) reaction sequences. Dendralenes have previously been shown to generate polycyclic frameworks in a step-economic manner. The 1-amino substituent is shown to promote very high levels of site selectivity in these processes. Chapter 1 …
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Multicomponent Diels-Alder Sequences of 1-Aminodendralenes
… in multicomponent diene-transmissive Diels-Alder (DTDA) reaction sequences. Dendralenes have previously been shown to generate polycyclic frameworks in a step-economic manner. The 1-amino substituent is shown to promote very high levels of site selectivity in these processes. Chapter 1 …
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ΜΕΘΟΔΟΣ ΣΥΝΘΕΣΗΣ Η/ΚΑΙ ΕΠΙΛΟΓΗΣ ΑΡΙΣΤΩΝ ΔΙΑΛΥΤΩΝ ΠΡΟΣ ΕΠΙΤΑΧΥΝΣΗ ΑΝΤΙΔΡΑΣΕΩΝ DIELS-ALDER
BASED ON A RELATION BETWEEN REACTIONS RATE AND ACTIVITY COEFFICIENTS (Γ) AND, ON A COMPUTING METHOD OF ACTIVITY COEFFICIENTS (NAMED UNIFAC), SOLVENTS EFFECTS WERE STUDIED ON 2 DIELS-ALDER REACTIONS RATE AND GENERAL CONCLUSIONS CAME OUT. THESE CONCLUSIONS WERE PROVED AND EXTENDED TO 9 DIELS-ALDER …
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Part I: Palladium PEPPSI-IPENT CI, A Useful Catalyst for Challenging Amination Reactions Part II: Generation Of Benzynes in Flow Reactors followed by Subsequent Diels-Alder Reactions
… address challenging Buchwald Hartwig amination reactions using Pd-NHC pre-catalysts. Specifically, we focused on: a) coupling of sterically hindered primary and secondary amines and b) coupling of 2-aminopyridine derivatives with aryl and heteroaryl halides. Although several approaches have been …
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SYNTHESES AND METAL MEDIATED REACTION CHEMISTRY OF 2-SILYL-1,3-DIENES
… bond forming processes and catalytic one-pot reactions remain challenges in organic synthesis. Since the discovery of the Diels-Alder reaction over eighty years ago, it has been one of the most important tools for synthetic organic chemists to synthesize as many as three carbocyclic rings in …
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Carbomagnesium mediated reactions: A versatile tool in organic synthesis.
… route from 144 to dienophiles for intramolecular Diels-Alder reactions. An expedient route to the Taxol A/B-ring system (329) was developed. This ring system underwent a facile enone accelerated Cope rearrangement to generate a bicylco[2.2.2]octanone ring system (330). Finally, the dienophiles …
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