نتایج جستجو برای: orthoesters

تعداد نتایج: 89  

ZrOCl2.8H2O@nano SiO2 has been synthesized for the first time via a simple procedure and characterized by SEM (scanning electron microscopy), FT-IR, and EDX (energy-dispersive X-ray) techniques. The efficiency of the prepared nanostructure has been explored for the synthesis of benzimidazoles via the condensation reaction of orthoesters and diamines at 60 °C under solvent-free conditions. The s...

Journal: :Molecules 2014
Klaus Banert Sandra Bochmann Andreas Ihle Oliver Plefka Florian Taubert Tina Walther Marcus Korb Tobias Rüffer Heinrich Lang

Cyclooctyne and cycloocten-5-yne undergo, at room temperature, a 1,3-dipolar cycloaddition with dialkyl acetylenedicarboxylates 1a,b to generate furan-derived short-lived intermediates 2, which can be trapped by two additional equivalents of 1a,b or alternatively by methanol, phenol, water or aldehydes to yield polycyclic products 3b-d, orthoesters 4a-c, ketones 5 or epoxides 6a,b, respectively...

Journal: :Organic & biomolecular chemistry 2014
Shivaji A Thadke Srinivas Hotha

Complex oligosaccharide syntheses employ the use of more than one glycosyl donor and hence, methods for the interconversion of glycosyl donors are highly valuable for the overall synthesis plan. Herein, n-pentenyl glycosides are efficiently converted to glycosyl 1,2-O-orthoesters in the presence of both acid and base sensitive functional groups. The identified protocol was found to be suitable ...

2013
Rongjian Xie Xingang Liu Chao Mai Zhanxiang Liu

An extension of our methodology on solid-phase synthesis of 3,4,5-trisubstituted-1,2,4-triazoles under mild conditions has been developed. Firstly, the resin-bound acylhydrazine is reacted with orthoesters to provide resin-bound 1,3,4oxadiazoles. Secondly, condensation of 1,3,4-oxadiazoles resin with the corresponding arylamines hydrochloride to form the resin-bound triazoles. 3,4,5-Trisubstitu...

2010
H M Sampath Kumar Sipak Joyasawal B V S Reddy P Pawan Chakravarthy A D Krishna J S Yadav

Allylic and benzylic alcohols are converted into corresponding unsymmetrical ethers when reacted with various orthoesters in the presence of montmorillonite KSF at ambient temperature. A detailed study has been undertaken to examine the mechanism and generality of these reactions with regard to various acidic catalysts, which reveal interesting competitive reactions mainly O-acetylation, togeth...

Journal: :Journal of Research of the National Bureau of Standards 1937

Journal: :European Journal of Organic Chemistry 2023

The pace and the scope of new molecules design is often constrained by limitations in synthetic chemistry. azaheterocyclic amidrazones are particular interest for bioisosteric considerations drug discovery. However, lack efficient access has undoubtedly hampered their occurrence chemical space. Our current results describe a robust relying on cyclization aminohydrazine presence various orthoest...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید