Showing papers on "Chiral Lewis acid published in 1989"
01 Jan 1989
TL;DR: In this paper, Lewis acid-driven cyclization reactions of Silyl Ketene Acetals with Imines and Zirconium (IV) chlorides are described.
Abstract: 1: Cationic Cyclization Reactions Terminated by Pinacol Rearrangements.- 2: Control of Electrophilicity in Aliphatic Friedel Crafts Reactions.- 3: New Reactions of Ketene Silyl Acetals with Imines Promoted by Titanium (IV) and Zirconium (IV) Chlorides.- 4: Stereoselective Synthesis with Silyl Ketene Acetals and TiC14.- 5: Mechanistic Variability in the Lewis Acid-Promoted Reactions of Aldehydes with Organostannanes.- 6: Synthetic and Mechanistic Studies of Lewis Acid Mediated C-C-Bond Formation.- 7: Acylation of Alkenes and Allylsilanes.- 8: Alkylaluminum Halide Induced Reactions of Carbonyl Compounds with Unactivated Alkenes.- 9: Intramolecular Additions of Allylsilanes to Conjugated Dienones.- 10: Lewis Acid-Catalyzed Stereoselection on Carbohydrate Templates.- 11: Lewis Acid Character and Selective Reactions of Pentacoordinate Silicon Compounds.- 12: Synthesis of Clerodane Diterpenes Via Lewis Acid Catalyzed Cycload-ditions.- 13: Studies on the Mechanism of Allylmetal-Acetal Additions.- 14: Stereocontrol in Organic Synthesis Using Silicon Compounds.- 15: Chiral Lewis Acid Catalysts Or-ganoaluminum and Boron Reagent.- Access to Trifluoromethyl Indans by Cycloalkylation of ss -Aryl Trifluoromethyl-Ketones.- A Route to Aliphatic Cycles Bearing a CF3 Group.- Lewis Acid Promoted Synthesis of ss-Lactams.- Lewis Acid Promoted Rearrangements of Vinyl Actals - Basics and Applications.- Lewis Acid Promoted Sequential Multifold Michael Reactions and Application to Syntheses of Terpenoids.- Lewis Acid-Promoted Cyclization Reactions by Way of Methoxycarbonyloxonium Ion Intermediates.- Stereo-chemistry of Anthracyclinones: Chelation Versus Non-chelation Control.- Reactivity of Organosilicon Compounds towards Carbenium Ions.- Aldol Condensations of Ketones Using Chiral Boron Reagents.- Synthesis of Hydroazulenic Lactones.- Lewis-Acid Induced Reactions of Organotin Compounds.- Silica Gel-Catalyzed Cyclizations of Mixed Ketene Acetals.- Substituent-Directed Oxidation.- Lewis Acid Catalyzed Hetero Diels Alder Reactions.- Lewis Acid Catalized Double Michael Addition.
136 citations
20 citations
TL;DR: In this paper, optically active ketone complexes are converted to Mosher esters in 80% to 98% of the cases of 79% to 90% of cases of 80%-98% de.
4 citations
TL;DR: In this article, an overview of the development trends in highly discriminative reactions using novel Lewis acid catalysts is given with the aid of selected examples and a novel reactivity of acyloxyborane derivatives and their usefulness in organic synthesis is demonstrated.
Abstract: With the aid of selected examples an overview is given of the development trends in highly discriminative reactions using novel Lewis acid catalysts. 1) Bulky organoaluminum reagent, methylaluminum 3,3′-bis(triphenylsilyl)-1,1′-bi-2-naphthoxide, has been successfully utilized for enantioselective activation of carbonyl moiety. 2) A novel reactivity of acyloxyborane derivatives and their usefulness in organic synthesis is demonstrated. As an example, asymmetric Diels-Alder reaction catalyzed by new acyloxyboranes derived from chiral acids is described.
3 citations