Results 41 to 50 of about 56,559 (262)

An Iodine-Vapor-Induced Cyclization in a Crystalline Molecular Flask [PDF]

, 2016
A vapor‐induced cyclization has been observed in the host environment of a crystalline molecular flask (CMF), within which 1,8‐bis(2‐phenylethynyl)naphthalene (bpen), a diarenynyl system primed for cyclization, was exposed to iodine vapor to yield the ...
Andrew D. Burrows, Knichal, Jane V, Shepherd, H.J., Paul R. Raithby, Jane V. Knichal, Chick C. Wilson, Raithby, Paul R, Knichal, Jane V., Shepherd, Helena J, Burrows, Andrew D, Wilson, Chick C, Helena J. Shepherd, Gee, William J., Gee, William J, Wilson, Chick C., Burrows, Andrew D., William J. Gee, Raithby, Paul R.   +17 more
core   +1 more source

Substituents Regulate the Cyclization of Conjugated Alkynes to Accurately Construct Cyclo-(E)-[3]dendralenes

Molecules, 2023
Substituent-regulated cyclization of conjugated alkynes with acid catalysis was developed in this paper, and it provides a straightforward synthesis of cyclic-(E)-[3]dendralenes.
Yun-Tao Xia, Ya-Xin Li, Tong-Tong Bi, Wei Lian, Xia Wang, Meng Yan, Tao Guo   +6 more
doaj   +1 more source

Enantioselective cyclizations and cyclization cascades of samarium ketyl radicals

Nature Chemistry, 2017
The rapid generation of molecular complexity from simple starting materials is a key challenge in synthesis. Enantioselective radical cyclization cascades have the potential to deliver complex, densely packed, polycyclic architectures, with control of three-dimensional shape, in one step.
Nicolas Kern, Mateusz P. Plesniak, Joseph J. W. McDouall, David J. Procter   +3 more
openaire   +5 more sources

Synthesis of New Potentially Bioactive Bicyclic 2-Pyridones

Molecules, 2005
Three convenient methods of reduction of the nitro group of 5-nitroimidazoles and 5-nitrothiazole that bear a diethylmethylene malonate group in an ortho-like position with respect to the nitro group and cyclization of the resulting amino derivatives are
Patrice Vanelle, Michel P. Crozet, Pascal George, Maxime D. Crozet   +3 more
doaj   +1 more source

Insights into Synergistic Effects of Counterion and Ligand on Diastereoselectivity Switch in Gold-Catalyzed Post-Ugi Ipso-Cyclization [PDF]

The concept of diastereoselectivity switch in gold catalysis is investigated, which primarily depends on the effects of ligand and counterion. The origins of gold-catalyzed post-Ugi ipso-cyclization for the diastereoselective synthesis of spirocyclic ...
Yunhe Li (165129), Mengyang Li (5348192), Jie Zhang (64655), Yan-bo Han (16379657), Jun He (46556), Xiang Zhao (539285)   +5 more
core   +1 more source

Computational Investigation of Mechanism and Selectivity in (3+2) Cycloaddition Reactions Involving Azaoxyallyl Cations

Reactions
Azaoxyallyl cations, as novel and versatile three-atom components, have been widely utilized in cycloaddition reactions, with the competition between O- and N-cyclization pathways remaining a key research focus.
Wei Zhou, Lei Zhang, Guixian Liu, Xiaosi Ma, Xiangtai Meng   +4 more
doaj   +1 more source

Natural Occurring and Engineered Enzymes for Peptide Ligation and Cyclization

Frontiers in Chemistry, 2019
The renaissance of peptides as prospective therapeutics has fostered the development of novel strategies for their synthesis and modification. In this context, besides the development of new chemical peptide ligation approaches, especially the use of ...
Timo Nuijens, Ana Toplak, Marcel Schmidt, Antonio Ricci, Walter Cabri, Walter Cabri   +5 more
doaj   +1 more source

Synthesis of 4-(Phenylchalcogenyl)tetrazolo[1,5-a]quinolines by Bicyclization of 2-Azidobenzaldehydes with Phenylchalcogenylacetonitrile

Molecules, 2023
A general methodology to access valuable 4-(phenylchalcogenyl)tetrazolo[1,5-a]quinolines was developed by the reaction of 2-azidobenzaldehyde with phenylchalcogenylacetonitriles (sulfur and selenium) in the presence of potassium carbonate (20 mol%) as a ...
Loana I. Monzon, Nicole C. M. Rocha, Gabriela T. Quadros, Pâmela P. P. Nunes, Roberta Cargnelutti, Raquel G. Jacob, Eder J. Lenardão, Gelson Perin, Daniela Hartwig   +8 more
doaj   +1 more source

Genomic Diversity and Clinical Variability in Pediatric Primary Cutaneous Anaplastic Large Cell Lymphoma: A Case Series

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Primary cutaneous anaplastic large cell lymphoma (pcALCL) is a rare pediatric CD30‐positive T‐cell lymphoproliferative disorder with an excellent prognosis, but its genomic drivers are poorly defined. We report three children with skin‐limited disease demonstrating striking molecular heterogeneity, including NPM::ALK, NUP214::FRK, and a novel ...
Shoshana Greenberger, Efrat Bar‐Ilan, Victoria Marcu, Evgeny Grishin, Rinat Yacobi, Aviv Barzilai, Hana Golan, Assaf Arie Barg   +7 more
wiley   +1 more source

Palladium(II)-catalyzed oxidative cascade cyclization reactions of anilides and anilines: Scope and mechanistic investigations [PDF]

, 2011
With Pd(OAc) 2/pyridine as the catalyst system and molecular oxygen as a green oxidant, acrylanilides and N-allylanilines undergo oxidative cascade cyclization to form heterocyclic rings in high yields.
Yang, D, Kai-Tai Yip, Yip, KT, Dan Yang
core   +1 more source