Heteroatom-Guided, Palladium-Catalyzed, Site-Selective CH Arylation of 4H-Chromenes: Diastereoselective Assembly of the Core Structure of Myristinin B through Dual CH Functionalization

2015 ◽  
Vol 21 (27) ◽  
pp. 9905-9911 ◽  
Author(s):  
Govind Goroba Pawar ◽  
Virendra Kumar Tiwari ◽  
Himanshu Sekhar Jena ◽  
Manmohan Kapur
Keyword(s):  
Core Structure ◽  
The Core ◽  
Palladium Catalyzed ◽  
Site Selective

Palladium-Catalyzed Medium-Ring Formation for Construction of the Core Structure of Laurencia Oxacycles: Synthetic Study of Laurendecumallene B

2013 ◽  
Vol 15 (12) ◽  
pp. 3046-3049 ◽  
Author(s):  
Yuji Yoshimitsu ◽  
Shinsuke Inuki ◽  
Shinya Oishi ◽  
Nobutaka Fujii ◽  
Hiroaki Ohno
Keyword(s):  
Ring Formation ◽  
Core Structure ◽  
The Core ◽  
Palladium Catalyzed ◽  
Medium Ring

Synthesis of the core structure of phalarine

2019 ◽  
Vol 17 (7) ◽  
pp. 1727-1730 ◽  
Author(s):  
Kazuya Douki ◽  
Jun Shimokawa ◽  
Masato Kitamura
Keyword(s):  
Core Structure ◽  
The Core ◽  
Palladium Catalyzed ◽  
Catalyzed Reactions

Two new palladium-catalyzed reactions enabled the synthesis of the core structure of phalarine.

Theoretical and experimental studies of palladium-catalyzed site-selective C(sp3)−H bond functionalization enabled by transient ligands

2017 ◽  
Author(s):  
Haibo Ge ◽  
Lei Pan ◽  
Piaoping Tang ◽  
Ke Yang ◽  
Mian Wang ◽  
...  
Keyword(s):  
Bond Activation ◽  
Theoretical Calculations ◽  
Experimental Studies ◽  
Bond Functionalization ◽  
Aliphatic Ketones ◽  
Site Selectivity ◽  
Mechanistic Investigation ◽  
Palladium Catalyzed ◽  
Metal Catalyzed ◽  
Site Selective

Transition metal-catalyzed selective C–H bond functionalization enabled by transient ligands has become an extremely attractive topic due to its economical and greener characteristics. However, catalytic pathways of this reaction process on unactivated sp<sup>3</sup> carbons of reactants have not been well studied yet. Herein, detailed mechanistic investigation on Pd-catalyzed C(sp<sup>3</sup>)–H bond activation with amino acids as transient ligands has been systematically conducted. The theoretical calculations showed that higher angle distortion of C(sp2)-H bond over C(sp3)-H bond and stronger nucleophilicity of benzylic anion over its aromatic counterpart, leading to higher reactivity of corresponding C(sp<sup>3</sup>)–H bonds; the angle strain of the directing rings of key intermediates determines the site-selectivity of aliphatic ketone substrates; replacement of glycine with β-alanine as the transient ligand can decrease the angle tension of the directing rings. Synthetic experiments have confirmed that β-alanine is indeed a more efficient transient ligand for arylation of β-secondary carbons of linear aliphatic ketones than its glycine counterpart.<br><br>

Indexicality of Grammar: The Case of Japanese Transgender Speakers

2019 ◽  
Author(s):  
Hideko Abe
Keyword(s):  
Gender Identity ◽  
Gender Identity Disorder ◽  
Grammatical Gender ◽  
Core Structure ◽  
Subject Positions ◽  
Transgender Identity ◽  
The Core ◽  
History Of ◽  
History Of Scholarship ◽  
Grammatical Structures

This article discusses how the intersection of grammatical gender and social gender, entwined in the core structure of language, can be analyzed to understand the dynamic status of selfhood. After reviewing a history of scholarship that demonstrates this claim, the discussion analyzes the language practices of transgender individuals in Japan, where transgender identity is currently understood in terms of sei-dōitsusei-shōgai (gender identity disorder). Based on fieldwork conducted between 2011 and 2017, the analysis reveals how individuals identifying with sei-dōitsusei-shōgai negotiate subject positions by manipulating the specific indexical meanings attached to grammatical structures.

Solvent-free and efficient synthesis of bicyclic 2-pyridone derivatives for endoplasmic reticulum imaging

2021 ◽  
Author(s):  
Xiaoyun Ran ◽  
Qian Zhou ◽  
Jin Zhang ◽  
Shanqiang Wang ◽  
Gui Wang ◽  
...  
Keyword(s):  
Endoplasmic Reticulum ◽  
Citric Acid ◽  
Core Structure ◽  
Solvent Free ◽  
Efficient Synthesis ◽  
The Core ◽  
Catalyst Free ◽  
Synthesis Approach ◽  
Ethylenediamine Derivatives

Started from citric acid (CA) and ethylenediamine derivatives, a solvent-free, catalyst-free and highly yield synthesis approach for bicyclic 2-pyridones was presented. Continuing to modify the core structure, a series of...

scholarly journals The Core Structure and Immunological Activities of Glycyrrhizan UA, the Main Polysaccharide from the Root of Glycyrrhiza uralensis.

1992 ◽  
Vol 40 (8) ◽  
pp. 2125-2128 ◽  
Author(s):  
Noriko SHIMIZU ◽  
Masashi TOMODA ◽  
Katsutoshi TAKADA ◽  
Ryoko GONDA
Keyword(s):  
Core Structure ◽  
Glycyrrhiza Uralensis ◽  
The Core

scholarly journals Lead cleavage sites in the core structure of group I intron-RNA

1993 ◽  
Vol 21 (2) ◽  
pp. 311-317 ◽  
Author(s):  
Barbara Striecjer ◽  
Uwe von Ahsen ◽  
Renée Schroeder
Keyword(s):  
Group I Intron ◽  
Core Structure ◽  
Cleavage Sites ◽  
The Core ◽  
Group I

scholarly journals Evaluation of Aberration-corrected Optical Sectioning for Exploring the Core Structure of ½[111] Screw Dislocations in BCC Metals

2017 ◽  
Vol 23 (S1) ◽  
pp. 432-433
Author(s):  
D. Hernandez-Maldonado ◽  
R. Groger ◽  
Q. M. Ramasse ◽  
P. B. Hirsch ◽  
P.D. Nellist
Keyword(s):  
Core Structure ◽  
Optical Sectioning ◽  
Screw Dislocations ◽  
The Core ◽  
Bcc Metals ◽  
Aberration Corrected
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