Results 31 to 40 of about 36,118 (224)

Directed evolution of lipase A from Bacillus subtilis for the preparation of enantiocomplementary sec-alcohols

open access: yesGreen Synthesis and Catalysis, 2021
Biocatalysts with tailor-made or controllable stereoselectivity are valuable and highly desired in the precision synthesis of chiral compounds. Most lipases display excellent (R)-enantioselectivity for various sec-alcohols.
Danyang Li   +5 more
doaj   +1 more source

Pd-catalyzed enantioselective aerobic oxidation of secondary alcohols: Applications to the total synthesis of alkaloids [PDF]

open access: yes, 2008
Enantioselective syntheses of the alkaloids (-)-aurantioclavine, (+)-amurensinine, (-)-lobeline, and (-)- and (+)-sedamine are described. The syntheses demonstrate the effectiveness of the Pd-catalyzed asymmetric oxidation of secondary alcohols in ...
Bagdanoff, Jeffrey T.   +5 more
core   +2 more sources

Stereodivergent, Diels-Alder-initiated organocascades employing α,β-unsaturated acylammonium salts: scope, mechanism, and application. [PDF]

open access: yes, 2017
Chiral α,β-unsaturated acylammonium salts are novel dienophiles enabling enantioselective Diels-Alder-lactonization (DAL) organocascades leading to cis- and trans-fused, bicyclic γ- and δ-lactones from readily prepared dienes, commodity acid chlorides ...
Abbasov, Mikail E   +3 more
core   +2 more sources

The "gate keeper" role of Trp222 determines the enantiopreference of diketoreductase toward 2-chloro-1-phenylethanone. [PDF]

open access: yesPLoS ONE, 2014
Trp222 of diketoreductase (DKR), an enzyme responsible for reducing a variety of ketones to chiral alcohols, is located at the hydrophobic dimeric interface of the C-terminus.
Hairong Ma   +4 more
doaj   +1 more source

Enantioselective Synthesis of the Ethyl Analog of the Marine Alkaloid Haliclorensin C

open access: yesMolecules, 2019
The enantioselective synthesis (3.7% overall yield in nine steps from 2) and biological screening of the ethyl analog of the macrocyclic marine alkaloid haliclorensin C (compound 5) are reported.
Guillaume Guignard   +4 more
doaj   +1 more source

Hybrid-Type Squaramide-Fused Amino Alcohol Organocatalysts for Enantioselective Nitro-Aldol Reaction of Nitromethane with Isatins [PDF]

open access: yes, 2017
A series of new hybrid type squaramide-fused amino alcohol (SFAA) catalysts were synthesized and their catalytic efficiency in enantioselective nitro-aldol reaction of various isatins with nitromethane that afford the chiral 3-substituted 3 ...
CHENNAPURAM Madhu   +8 more
core   +2 more sources

Concise methods for the synthesis of chiral polyoxazolines and their application in asymmetric hydrosilylation

open access: yesBeilstein Journal of Organic Chemistry, 2010
Seven polyoxazoline ligands were synthesized in high yield in a one-pot reaction by heating polycarboxylic acids or their esters and chiral β-amino alcohols under reflux with concomitant removal of water or the alcohol produced in the reaction.
Wei Jie Li, Zun Le Xu, Sheng Xiang Qiu
doaj   +1 more source

Garner’s aldehyde as a versatile intermediate in the synthesis of enantiopure natural products

open access: yesBeilstein Journal of Organic Chemistry, 2013
Since its introduction to the synthetic community in 1984, Garner’s aldehyde has gained substantial attention as a chiral intermediate for the synthesis of numerous amino alcohol derivatives.
Mikko Passiniemi, Ari M.P. Koskinen
doaj   +1 more source

Stereochemical assignment of the protein-protein interaction inhibitor JBIR-22 by total synthesis [PDF]

open access: yes, 2015
The authors acknowledge the EPSRC and Cancer Research UK (CRUK Grant No. C21383/A6950) for funding this research.Recent reports have highlighted the biological activity associated with a sub-family of the tetramic acid class of natural products.
Healy, Alan   +4 more
core   +1 more source

Exploring chemical diversity via a modular reaction pairing strategy

open access: yesBeilstein Journal of Organic Chemistry, 2012
The efficient synthesis of an 80-member library of unique benzoxathiazocine 1,1-dioxides by a microwave-assisted, intermolecular nucleophilic aromatic substitution (SNAr) diversification pathway is reported.
Joanna K. Loh   +7 more
doaj   +1 more source

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