نتایج جستجو برای: carbamates

تعداد نتایج: 2117  

2015
Arun K. Ghosh Margherita Brindisi

The carbamate group is a key structural motif in many approved drugs and prodrugs. There is an increasing use of carbamates in medicinal chemistry and many derivatives are specifically designed to make drug-target interactions through their carbamate moiety. In this Perspective, we present properties and stabilities of carbamates, reagents and chemical methodologies for the synthesis of carbama...

2011
Devdutt Chaturvedi

Organic carbamates represent an important class of compounds showing various interesting properties. They find wide utility in various areas as pharmaceuticals, agrochemicals (pesticides, herbicides, insecticides, fungicides etc.), intermediates in organic synthesis, protection of amino group in peptide chemistry, and as linker in combinatorial chemistry etc. Classical synthesis of carbamates i...

Journal: :Macromolecules 2021

Polyglycerols are a class of multifunctional polymers obtained from the polymerization glycidol and its derivatives. Unlike poly(ethylene glycol) (PEG), which is most common polyether, polyglycerols can exhibit many functionalities on their side chains be renewable resources, mainly glycerol. Hereby, this study will focus glycidyl carbamates, new monomers readily available glycerol carbonate, c...

Journal: :Organic letters 2005
Lavinia Panella Ben L Feringa Johannes G de Vries Adriaan J Minnaard

[reaction: see text] Monodentate phosphoramidites, in particular PipPhos and its octahydro analogue, are excellent ligands for the rhodium-catalyzed asymmetric hydrogenation of aromatic enol acetates, enol carbamates, and 2-dienol carbamates up to 98% ee. These latter substrates were hydrogenated selectively to the carbamates of the allyl alcohol.

1998
George C. Chen Roger M. Rowell Dale Ellis

Fluorine substituents in the phenyl ring of methyl fluorophenyl carbamates and fluorophenyl isocyanates were varied to determine the influence of fluorine substituents on fungal resistance of wood containing them. In southern pine impregnated with methyl fluorophenyl carbamates, increased fluorine substitution of the phenyl ring increased fungal resistance. Methyl pentafluorophenyl carbamate an...

Journal: :Journal of chromatographic science 2002
Xiling Song Harold M McNair

Direct gas chromatographic (GC) analysis of thermally labile N-carbamates is studied by using fast GC with cold on-column injection. With the greatly reduced injection temperature, short column lengths, high flow rate, and fast temperature-programming rate, the exposure of carbamates to high temperature is reduced and degradation can be avoided. Nine N-carbamates in EPA Method 531 are eluted wi...

2014
María Guadalupe Prado-Ochoa Víctor Hugo Abrego-Reyes Ana María Velázquez-Sánchez Marco Antonio Muñoz-Guzmán Patricia Ramírez-Noguera Enrique Angeles Fernando Alba-Hurtado

Female and male Wistar rats were used to determine the subchronic oral toxicities of two new ethyl-carbamates with ixodicidal activities (ethyl-4-bromphenyl-carbamate and ethyl-4-chlorphenyl-carbamate). The evaluated carbamates were administered in the drinking water (12.5, 25 and 50 mg/kg/day) for 90 days. Exposure to the evaluated carbamates did not cause mortality or clinical signs and did n...

Journal: :Cancer research 1969
M B Shimkin R Wieder M McDonough L Fishbein D Swern

A'séfiesof 21 carbamates and 8 aziridines were compared for quantitative carcinogenic activity using the pulmonary tumorinduction method in Strain A mice foi bîoassay. Aziridines as a class were more active than the carbamates, with 3,4-dichlorophertyl-jV-carbamoylaziridine being over 20 times more active on a molecular dose basis than urethan, the most active of the carbamates. Three carbama...

Journal: :Drug metabolism reviews 2010
Federica Vacondio Claudia Silva Marco Mor Bernard Testa

The aims of this review were 1) to compile a large number of reliable literature data on the metabolic hydrolysis of medicinal carbamates and 2) to extract from such data a qualitative relation between molecular structure and lability to metabolic hydrolysis. The compounds were classified according to the nature of their substituents (R³OCONR¹R²), and a metabolic lability score was calculated f...

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