Results 231 to 240 of about 77,395 (287)
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Diels–Alder and Formal Diels–Alder Cycloaddition Reactions of Ynamines and Ynamides
European Journal of Organic Chemistry, 2017Nitrogen‐substituted alkynes such as ynamines and ynamides are competent partners in [4+2] cycloaddition reactions. This microreview aims to discuss in a historical context the main achievements in the work on this class of reactions that leads to valuable nitrogen‐containing heterocycles in a single‐step fashion.
Vincent Bizet, Nicolas Blanchard
exaly +3 more sources
How Lewis Acids Catalyze Diels–Alder Reactions [PDF]
Angewandte Chemie - International Edition, 2020 The Lewis acid(LA)-catalyzed Diels–Alder reaction between isoprene and methyl acrylate was investigated quantum chemically using a combined density functional theory and coupled-cluster theory approach.
Pascal Vermeeren, Trevor A Hamlin
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An Integrated Building Block for Cascade Diels–Alder and Hetero-Diels–Alder Reactions
Organic Letters, 2022The Diels-Alder (DA) reaction and hetero-Diels-Alder (HDA) reaction are among the most powerful methods for the construction of carbocycles and heterocycles. Herein, an integrated building block of DA and HDA reactions is described. The triazenyl dienes could undergo a DA reaction, while the newly released alkene moiety and the triazene were able to ...
Shuheng Xu, Linwei Zeng, Sunliang Cui
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A Diels–Alder Approach to (−)‐Ovalicin
Angewandte Chemie International Edition, 2007A round at the Oval: The antiangiogenic activity of the natural product ovalicin has sparked significant interest. A highly efficient enantio- and diastereoselective total synthesis of ovalicin proved successful in which the key step involved an endo selective Diels-Alder reaction (see scheme, PG = protecting group). (Chemical Equation Presented).
Tiefenbacher, Konrad +2 more
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A Diels-Alder, retro-Diels-Alder approach to arcyriaflavin-A
Tetrahedron Letters, 1999Abstract 2,2′-Bi-indolyl-3,3′-dithiete and maleimide participate in a [4 + 2] cycloaddition reaction to provide arcyriaflavin-A.
M.Manuel B. Marques +3 more
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Dehydrogenative Diels–Alder Reaction
Organic Letters, 2011The dehydrogenative cycloaddition of dieneynes, which possess a diene in the form of a styrene moiety and a dienophile in the form of an alkyne moiety, produces naphthalene derivatives when heated. It was found that a key requirement of this process is the presence of a silyl group attached to the alkyne moiety, which forces a dehydrogenation reaction ...
Takuya, Ozawa +2 more
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ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Jeremy I. Levin, Leif M. Laakso
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AbstractFor Abstract see ChemInform Abstract in Full Text.
Jeremy I. Levin, Leif M. Laakso
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The Diels–Alder Cyclization of Ketenimines
Organic Letters, 2012A Diels-Alder reaction between cyclopentadiene and a variety of ketenimines is reported. A copper(I)-bis(phosphine complex catalyzes the cycloaddition across the C═N bond of the ketenimine in a [4 + 2] reaction to give an enamine intermediate that is hydrolyzed upon purification to generate aminoketones.
Jeremy, Erb +4 more
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A New Chiral Anthracene for the Asymmetric Diels−Alder/Retro-Diels−Alder Sequence
Organic Letters, 2004(-)-(R)-9-(1,2-Dimethoxyethyl)anthracene (8) is successfully employed as a chiral template in the Diels-Alder/retro-Diels-Alder sequence for the preparation of alpha,beta-unsaturated lactams. The cycloadditions proceed with complete diastereoselectivity, and regioselectivity in subsequent transformations of the carbonyl groups is also excellent.
Kerrie L, Burgess +4 more
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2009
The Diels–Alder reaction, inverse electronic demand Diels–Alder reaction, as well as the hetero-Diels–Alder reaction, belong to the category of [4+2]-cycloaddition reactions, which are concerted processes.
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The Diels–Alder reaction, inverse electronic demand Diels–Alder reaction, as well as the hetero-Diels–Alder reaction, belong to the category of [4+2]-cycloaddition reactions, which are concerted processes.
openaire +1 more source