Results 121 to 130 of about 22,717 (244)

Elastic and electronically inelastic scattering of electrons by 2H-pyran and 4H-pyran molecules

Journal of Applied Physics
We report on elastic and electronically inelastic integral and differential cross sections for electron collisions with the 2H-pyran and 4H-pyran molecules. The scattering calculations were performed with the Schwinger multichannel method and aimed to (i) investigate the formation of resonant states, (ii) assign and compare the resonance spectrum of ...
Murilo O. Silva, Giseli M. Moreira, Márcio H. F. Bettega, Romarly F. da Costa   +3 more
openaire   +1 more source

Asymmetric Synthesis of Tertiary α‐Aryl Stereocentres in Tetrahydro‐4H‐pyran‐4‐ones Using Pd‐Catalyzed Decarboxylative Asymmetric Protonation

European Journal of Organic Chemistry, Volume 29, Issue 36, 24 September 2026.
The Pd‐catalyzed decarboxylative asymmetric protonation (DAP) has been developed for sterically hindered tetrahydro‐4H‐pyran‐4‐one derived α‐aryl‐β‐keto esters. A substrate scope of nine examples of DAP showed that substrates containing a di‐ortho methoxy substitution pattern on the aryl ring gave rise to the highest enantioselectivities of up to 85 ...
Fionn McNeill, Joffrey Scriven, Fritz Bahns, Anugam V. Krishna, Julia Bruno‐Colmenarez, Patrick J. Guiry   +5 more
wiley   +1 more source

Transformation of substituted 2H-pyran-5-carboxylates into 3R*-vinyl-1,2R*-cyclopropanedicarboxylates

, 1998
Substituted alkyl 2H-pyran-5-carboxylates, 1, have been condensed with methyl 2-(triphenylarsoranylidene) ethanoate, 14a, to form substituted 3-vinyl-1,2-cyclopropanedicarboxylates, 15, and, in a number of cases, 2,3-dihydro-3-vinyl-2,4 ...
Moorhoff, CM (15481859), Winkler, D (15483170)   +1 more
core  

One-pot synthesis of perhydrofuro[2,3-b]pyran derivatives

, 2003
TiCl 4 mediated addition of 3,4-dihydro-2H-pyran to (2-trimethylsilyl)ethyl pyruvate results in a one-pot addition-cyclisation sequence to deliver a functionalised perhydrofuro[2,3-b]pyran derivative in good ...
Flower, SE, Michael C. Willis, Stephen E. Flower, Willis, MC   +3 more
core   +1 more source

Michael reaction of methylenemalonaldehydes: Synthetic approach to 4H-pyran-5-carboxaldehydes and 2-amino-4H-pyran-5-carboxaldehydes

, 1987
Base-catalyzed addition of β-dicarbonyl compounds to methylenemalonaldehydes led to tetracarbonyl compounds II which were dehydrated in an acid medium to 4H-pyran-5-carboxaldehydes III.
Jana Hodačová, Vladimír Král, Zdeněk Arnold, Dalimil Dvořák, David Šaman   +4 more
core   +1 more source

Para toluenesulfonic acid-catalyzed one-pot, three-component synthesis of benzo[5,6]chromeno[3,2-c]quinoline compounds in aqueous medium

Heterocyclic Communications, 2021
Orang Naser Sadeghpour, Soltani Hadi, Ghiamirad Mehdi, Sabegh Mehdi Ahmadi   +3 more
doaj   +1 more source

Syntetické studie na 5,6-dihydro-2H-pyran-2-onech [PDF]

, 2018
Univerzita Karlova Farmaceutická fakulta v Hradci Králové Katedra organické a bioorganické chemie Kandidát: Gabriela Matejová Školiteľ: PharmDr. Marcel Špulák, Ph.D.
Matejová, Gabriela
core  

A Novel and Highly Stereoselective Synthesis of 2-Substituted Perhydrofuro[2,3-b]pyran Derivatives

, 2011
An effective and facile method for the synthesis of 2-substituted perhydrofuro[2,3-b]pyran derivatives Is described. The cyclization of 2-C-aldehydo-2-deoxy-D-thioglucoside in the presence of N-iodosuccinimide (NIS) is highly stereoselective.
Tian, Qiang, Ma, Xiaofeng, Zhao, Jinzhong, Shao, HW (reprint author), Chinese Acad Sci, Chengdu Inst Biol, Nat Prod Res Ctr, Chengdu 610041, Peoples R China., Shao, Huawu, Tang, Qin   +5 more
core  

Mechanistic inhibition of herpes simplex virus-1 UL21 immune-evasion function by natural-product scaffolds: A multi-tier docking, dynamics, and energetic profiling approach. [PDF]

PLoS One
Suleman M, Ali I, Sayaf AM, Hassan F, Ilahi U, Alissa M, Crovella S, Shaito AA, Yassine HM.   +8 more
europepmc   +1 more source

Synthesis of photoactive compounds from 2<i>H</i>-pyran-2-ones and their photophysical properties. [PDF]

RSC Adv
Shaw R, Kosliya RY, Althagafi I, Pooja, Pratap R.   +4 more
europepmc   +1 more source