Anionic Michael-type cyclization is an alternative to radical cyclization of activated olefins. Metal-catalyzed cyclization ... Radical cyclizations are much faster than analogous anionic cyclizations, and avoid β-elimination side reactions. ... 8) In comparison to cationic cyclizations, radical cyclizations avoid issues associated with Wagner-Meerwein rearrangements, do ... exo cyclization is favored over endo cyclization (macrocyclizations constitute the major exception to this rule). 5-hexenyl ...
The Pschorr cyclization is a name reaction in organic chemistry, which was named after its discoverer, the German chemist ... The Pschorr cyclization has a relatively good atom economy, since essentially only nitrogen is produces as a waste material. ... However, when considering the atom economy it as to be mentioned that the Pschorr cyclization has often only low yields. Robert ... The following reaction scheme shows the Pschorr cyclization for the example of phenanthrene: In the course of the Pschorr ...
New catalysts for cationic cyclization may be of general use in the formation of carbon-carbon and carbon-heteroatom bonds ... An antibody has been induced that efficiently catalyzes a cationic cyclization in which an acyclic olefinic sulfonate ester ...
In this work, we investigated the cyclization reaction in the cyclodipeptide synthase AlbC using QM/MM methods and free energy ... As a final step of the catalytic reaction, the dipeptidyl group undergoes intramolecular cyclization to generate the target ... Y178 and H203 maintain the correct conformation of the dipeptide needed for the cyclization reaction. The mechanism discovered ... Mechanism of cyclization. We investigated the mechanism of cyclization in AlbC using the QM/MM free energy method described in ...
... many exciting reports have demonstrated the broad scope and synthetic utility of ene cyclization and the versatility of oxonium ... The ene cyclization has evolved to become an indispensable tool for the synthesis of various ring size heterocyclic compounds. ... Ene cyclization reaction in heterocycle synthesis P. Saha and A. K. Saikia, Org. Biomol. Chem., 2018, 16, 2820 DOI: 10.1039/ ... The ene cyclization has evolved to become an indispensable tool for the synthesis of various ring size heterocyclic compounds. ...
An Investigation of Norpropoxyphene Cyclization in Methanol. By: Huahua Jian Ph.D, Sandra Ybarra, Derrell Johnson MS, Isil ...
Harrison, A. G. Cyclization of Peptide b9 Ions. J. Am. Soc. Mass Spectrom. 2009, 10, 2248-2253.CrossRefGoogle Scholar ... Harrison, A. G. Sequence Scrambling Through Cyclization of b 5 Ions. J. Am. Soc. Mass Spectrom. 2008, 19, 1776-1780.CrossRef ... Chen, X.; Yu, L.; Steill, J. D.; Oomens, J.; Polfer, N. C. Effect of Peptide Fragment Size on the Propensity of Cyclization in ... This indicates less active cyclization/reopening followed by fragmentation of common structures for b n ions containing His ...
... Solstice-TDS 2016.1 Product Release: Beaverton, Ore., June 23, 2016 ... The latest innovation in Solstice-TDS 2016.1 is the TimeTable module offering the state-of-the-art automatic cyclization ... TSSI Unveils Automatic Cyclization Technology in the Latest Solstice-TDS 2016.1 Product Release ...
Under similar conditions, the Prins cyclization of six alcohols containing an endocyclic double bond (primary, secondary, or ... The iodine-catalyzed Prins cyclization of homoallylic alcohols and aldehydes was investigated under metal-free conditions and ... Keywords: isochromene; pyrans; prins cyclization; iodine; DFT calculations isochromene; pyrans; prins cyclization; iodine; DFT ... Iodine-Catalyzed Prins Cyclization of Homoallylic Alcohols and Aldehydes. Kachi R. Kishore Kumar Reddy 1. ...
T 1518/11 (Enamine cyclisation/TAIGEN) of 13.8.2013. European Case Law Identifier:. ECLI:EP:BA:2013:T151811.20130813. ... It includes the cyclisation of quinolone precursor admixtures wherein each of the compounds a) and b) could have been prepared ...
The cyclization reaction may be carried out in the absence of an added solvent or in the presence of a solvent.. Preferred ... As indicated in Table I, the mol percent yield of BBL from the cyclization was 83.1% and the BBL assayed 96.6% purity. The ... Sufficient base, such as the alkali, is used to maintain the pH below 4.0 during the cyclization, for example from about0.5 to ... In this example BBL was produced in a cyclization reaction carried out neat, that is, without an added organic solvent.. DBBA ...
Involvement of cyclization reaction in the structure; Transfer of geranyl moiety to the modified tryptophan; Description on the ...
Alkynoic acids derived from salicylic acid and analogues undergo arylative cyclization with arenediazonium salts promoted by ... Gold promoted arylative cyclization of alkynoic acids with arenediazonium salts U. A. Carrillo-Arcos and S. Porcel, Org. Biomol ... Alkynoic acids derived from salicylic acid and analogues undergo arylative cyclization with arenediazonium salts promoted by ...
One-Pot Tandem Synthesis of 2-Arylquinazolines by a Multicomponent Cyclization Reaction. Leping Ye * , Lin Yu, Lijun Zhu and ... Ye L, Yu L, Zhu L, Xia X. One-Pot Tandem Synthesis of 2-Arylquinazolines by a Multicomponent Cyclization Reaction. Molecules. ... Ye, L.; Yu, L.; Zhu, L.; Xia, X. One-Pot Tandem Synthesis of 2-Arylquinazolines by a Multicomponent Cyclization Reaction. ... Keywords: quinazolines; multicomponent; cyclization reaction; one-pot tandem synthesis quinazolines; multicomponent; ...
Carroll, F., Ferguson, A. M., & Lewis, J. B. (1966). Studies Concerning the Cyclization of Some 4-Bromoacetylpiperidines to the ... Studies Concerning the Cyclization of Some 4-Bromoacetylpiperidines to the Corresponding 3-Quinuclidinones. ...
Abstract: L28.00012 : A Generalized Theory of DNA Looping and Cyclization. 4:42 PM-4:54 PM. ...
... for a reversible Bergman cyclization. Researchers used non-contact AFM to observe this molecular rearrangement, a key step in ... Reversible Bergman cyclization. Atomic force microscopy (AFM) image of the starting point (a brominated aromatic compound) ... Keywords: 1, 2016, 21st century, afm image, aromatic, atomic force microscope, atomic force microscopy, bergman cyclization, ... Caption: Reversible Bergman cyclization. Atomic force microscopy (AFM) image of the starting point (a brominated aromatic ...
... Srivastava, Puneet Uppsala University, Disciplinary Domain of Science and ... A novel route to cyclic imines based on 5-exo radical cyclization is explored. The radical precursors are imines prepared from ... Radicals, alpha-Phenylselenenyl ketones, Delta(1)-Pyrrolines, 5-exo cyclization National Category Chemical Sciences Identifiers ...
... B. Jayachandra Reddy and ... The key steps were microwave assisted Friedel-crafts acylation and diol cyclization carried out via an ultra sonication of ...
Unconventional cyclization of Euphorbia diterpenes. Dan Luo, Roberta Callari, Britta Hamberger, Sileshi Gizachew Wubshet, ... Unconventional cyclization of Euphorbia diterpenes. Dan Luo, Roberta Callari, Britta Hamberger, Sileshi Gizachew Wubshet, ... the regio-specific oxidations of casbene by the P450s initiate and precede the intramolecular cyclization and this cyclization ... leading to the subsequent rearrangement and cyclization. The discovery of this nonconventional cyclization may provide the key ...
Hypervalent Iodine(III)-Induced Domino Oxidative Cyclization for the Synthesis of Cyclopenta[b]furans. Mei-Huey Lin * , Yu-Chun ... Lin M-H, Chen Y-C, Chiu S-H, Chen Y-F, Chuang T-H. Hypervalent Iodine(III)-Induced Domino Oxidative Cyclization for the ... Lin, M.-H.; Chen, Y.-C.; Chiu, S.-H.; Chen, Y.-F.; Chuang, T.-H. Hypervalent Iodine(III)-Induced Domino Oxidative Cyclization ... "Hypervalent Iodine(III)-Induced Domino Oxidative Cyclization for the Synthesis of Cyclopenta[b]furans." Molecules 21, no. 12: ...
... Zhen Wang, Yoichiro Kuninobu* and ... cyclization, a new nitrogen-sulfur bond is formed by N-H/S-H coupling. The present reaction tolerates various functional groups ...
Tyrosine-lipid peroxide adducts from radical termination: para coupling and intramolecular Diels-Alder cyclization.. [Roman ... The primary peroxide adducts subsequently undergo intramolecular Diels-Alder (IMDA) cyclization, affording a number of ...
We report the palladium-catalyzed enantioselective cyclization of 1,6-enamidynes to form spirocyclic ring systems. We applied ... We report the palladium-catalyzed enantioselective cyclization of 1,6-enamidynes to form spirocyclic ring systems. We applied ...