Results 31 to 40 of about 3,123,489 (311)

Computational and Experimental Studies on the α-Functionalization of Ketones Using Domino Reactions: A Strategy to Increase Chemoselectivity at the α-Carbon of Ketones

Molecules
A facile strategy to increase the chemoselectivity of domino reactions was proposed and successfully applied in the α-functionalization of ketones.
Hui Sun, Li-Heng Yang, Meng-Yun Fu, Bin Cui   +3 more
doaj   +1 more source

MCM-41-supported L-phenylalaninol as a chiral heterogeneous ligand in the enantioselective Kharasch-Sosnovsky reaction

Results in Chemistry
In this study, L-phenylalaninol, synthesized from the reduction of naturally occurring L-phenylalanine, was immobilized on MCM-41. The resulting heterogeneous ligand was comprehensively characterized using various spectroscopic techniques, such as FT-IR,
Saadi Samadi, Shadi Kamangar, Hamid Arvinnezhad, Parya Noori   +3 more
doaj   +1 more source

Chiral Syn-1,3-diol Derivatives via a One-Pot Diastereoselective Carboxylation/ Bromocyclization of Homoallylic Alcohols

iScience, 2018
Summary: Chiral syn-1,3-diols are fundamental structural motifs in many natural products and drugs. The traditional Narasaka-Prasad diastereoselective reduction from chiral β-hydroxyketones is an important process for the synthesis of these ...
Guanxin Huang, Minjie Liu, Fangjun Xiong, Ge Meng, Yuan Tao, Yan Wu, Haihui Peng, Fener Chen   +7 more
doaj   +1 more source

Asymmetric Total Synthesis of Pseurotin A [PDF]

Organic Letters, 2003
The asymmetric total syntheses of pseurotin A and 8-O-demethylpseurotin A have been accomplished. Key reactions are a NaH-promoted intramolecular cyclization of an alkynylamide to form a gamma-lactam, an aldol reaction of a benzylidene-substituted ketone, and the late-stage introduction of the benzoyl group by a selective oxidation of a benzylidene ...
Yujiro, Hayashi, Mitsuru, Shoji, Shinpei, Yamaguchi, Takasuke, Mukaiyama, Junichiro, Yamaguchi, Hideaki, Kakeya, Hiroyuki, Osada   +6 more
openaire   +2 more sources

Synthesis and Applications of Asymmetric Catalysis Using Chiral Ligands Containing Quinoline Motifs

SynOpen, 2022
In the past decade, asymmetric synthesis of chiral ligands containing quinoline motifs, a family of natural products displaying a broad range of structural diversity and their metal complexes, have become the most significant methodology for the ...
Vasudevan Dhayalan, Rambabu Dandela, K. Bavya Devi, Ragupathy Dhanusuraman   +3 more
doaj   +1 more source

Optimized Asymmetric Synthesis of Umuravumbolide

ACS Omega, 2022
Herein, the asymmetric synthesis of umuravumbolide (1) is described. The new approach features highly stereoselective transformations (dr ≥ 95:5) to install both stereocenters and the Z olefin, which involve a new radical alkylation, an Ando olefination, and a Krische allylation on a Z allylic alcohol, not reported before.
Marina Pérez-Palau, Eduard Balaguer-Garcia, Pedro Romea, Fèlix Urpí   +3 more
openaire   +3 more sources

Residual tail twisting in ascidian larvae is stabilized by asymmetric myofibrils that resist bilateral symmetry restoration

FEBS Letters, EarlyView.
Ascidian Ciona larvae initially show strong clockwise tail twisting, which is largely corrected during development. However, a small residual twist remains. This study shows that organized helical myofibrils in tail muscles mechanically stabilize this residual asymmetry, preventing complete restoration of bilateral symmetry and revealing how embryos ...
Yuki S. Kogure, Misaki K. Nishio, Satoru Okuda, Kohji Hotta   +3 more
wiley   +1 more source

Asymmetric synthesis of enantioenriched spirocycles via a chiral Brønsted acid catalyzed desymmetrization [PDF]

, 2019
Asymmetric methodologies are very important as they allow chemists to produce significant quantities of complex chiral molecules as enantiopure or enantioenriched compounds.
Minerali, Eni, NC DOCKS at The University of North Carolina at Greensboro   +1 more
core  

Chiral amido-oxazoline functionalized MCM-41: A sustainable heterogeneous catalyst for enantioselective Kharasch–Sosnovsky and Henry reactions

Heliyon
In this study, a series of chiral amido-oxazoline ligands was synthesized with a primary focus on immobilizing the most effective ligands on MCM-41 mesoporous material.
Niloofar Tavakoli, Hamid Arvinnezhad, Shiva Majidian, Mahsa Mahramasrar, Khosrow Jadidi, Saadi Samadi   +5 more
doaj   +1 more source

Therapeutic Effects of Coumarins with Different Substitution Patterns

Molecules, 2023
The use of derivatives of natural and synthetic origin has gained attention because of their therapeutic effects against human diseases. Coumarins are one of the most common organic molecules and are used in medicine for their pharmacological and ...
Virginia Flores-Morales, Ana P. Villasana-Ruíz, Idalia Garza-Veloz, Samantha González-Delgado, Margarita L. Martinez-Fierro   +4 more
doaj   +1 more source