Results 101 to 110 of about 24,641 (321)

Nickel-Catalyzed Asymmetric Reductive Cross-Coupling between Heteroaryl Iodides and α-Chloronitriles [PDF]

open access: yes, 2015
A Ni-catalyzed asymmetric reductive cross-coupling of heteroaryl iodides and α-chloronitriles has been developed. This method furnishes enantioenriched α,α-disubstituted nitriles from simple organohalide building blocks.
Kadunce, Nathaniel T., Reisman, Sarah E.
core   +4 more sources

Opportunities and challenges for direct C–H functionalization of piperazines

open access: yesBeilstein Journal of Organic Chemistry, 2016
Piperazine ranks within the top three most utilized N-heterocyclic moieties in FDA-approved small-molecule pharmaceuticals. Herein we summarize the current synthetic methods available to perform C–H functionalization on piperazines in order to lend ...
Zhishi Ye, Kristen E. Gettys, Mingji Dai
doaj   +1 more source

New One-Pot Methodologies for the Modification or Synthesis of Alkaloid Scaffolds

open access: yesMarine Drugs, 2010
There are several avenues by which promising bioactive natural products can be produced in sufficient quantities to enable lead optimization and medicinal chemistry studies. The total synthesis of natural products is an important, but sometimes difficult,
Amir E. Wahba, Mark T. Hamann
doaj   +1 more source

Diastereoselective synthesis of some novel benzopyranopyridine derivatives

open access: yesBeilstein Journal of Organic Chemistry, 2006
BackgroundThe formation of novel N-substituted-1,2,3,4-tetrahydro[1,3]-dioxolo-[6,7]-5H-[1]benzopyrano [3,4-c]pyridines were observed unexpectedly during the acid-mediated ketal removal of ethylenedioxy ketal protected 4-piperidones.
Pradeep K. Mohakhud   +6 more
doaj   +1 more source

1,3-Dipolar cycloadditions of 2-thio-3-chloroacrylamides with nitrile oxides and nitrones [PDF]

open access: yes, 2010
1,3-Dipolar cycloadditions of 2-thio-3-chloroacrylamides with nitrile oxides and nitrones is described. A series of novel isoxazolines are isolated from the nitrile oxide cycloadditions, whilst the isoxazolines generated from the nitrone cycloadditions ...
Kissane, Marie   +2 more
core   +1 more source

Synthesis of N-heterocycles from diamines via H2-driven NADPH recycling in the presence of O2 [PDF]

open access: yes, 2019
Herein, we report an enzymatic cascade involving an oxidase, an imine reductase and a hydrogenase for the H2-driven synthesis of N-heterocycles.
Al-Shameri, Ammar   +5 more
core   +1 more source

The Synthesis and Biological Activity of 1-Alkyl-4-(3-azacyclobenzoyl)-5-hydroxypyrazole Herbicides

open access: yesCHIMIA, 2003
The benzoylpyrazoles belong to a class of herbicides that inhibit the enzyme 4-hydroxy-phenylpyruvate dioxygenase (HPPD). This mode of action is characterized by bleaching due to the disruption of plastoquinone and ?-tocopherol biosynthesis ...
Zoltan Benko   +8 more
doaj   +1 more source

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