Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Harish R. Talele"'
Publikováno v:
ARKIVOC, Vol 2011, Iss 9, Pp 15-37 (2011)
Externí odkaz:
https://doaj.org/article/c406d30ec5c7420cb20964edd728820d
Publikováno v:
The Journal of Organic Chemistry. 81:7751-7759
Synthesis and study of aza[7]helicene and aza[9]helicene is presented in this paper. Photo-dehydrocyclization of the 3,6-bis-styryl derivative of carbazole leading to sterically less demanding aza[7]helicene resulted in smooth reaction, and only the
Autor:
David Šaman, Dušan Koval, Harish R. Talele, Filip Teplý, Paul E. Reyes-Gutiérrez, Ivana Císařová, Lucie Bednárová, Petra Sázelová, Václav Kašička, Lukáš Severa
Publikováno v:
Chemistry (Weinheim an der Bergstrasse, Germany). 24(30)
Diquats with extremely high racemization barriers with ΔG≠theor of 233 kJ mol-1 at 180 °C are described. Reported configurational robustness is due to a combination of two structural features: the rigid o-xylylene tether connecting the nitrogen a
Publikováno v:
Tetrahedron Letters. 55:5394-5399
Synthesis of four derivatives of symmetrical aza[7]helicenes is achieved by I2-THF mediated photocyclization of corresponding bis-styryl derivatives. The cyclization furnished the desired angularly fused aza-helicene in moderate yields. The structure
Publikováno v:
Journal of Heterocyclic Chemistry. 52:914-918
The phenomenon of peri interaction of 1,8-disubstituted naphthalene has been utilized to construct small molecules with internal twist resulting in helical isomers. A series of new naphthalene-attached coumarins have been synthesized and characterize
Publikováno v:
Organic Letters. 14:3166-3169
A series of novel 1,3-oxazines were prepared to construct a helical framework. The 1,3-oxazine attached to the phenanthrene unit showed a small bite angle θ (∼12°), while the units attached to [4]helicene showed a larger θ (∼35°) and exhibite
Publikováno v:
ARKIVOC, Vol 2011, Iss 9, Pp 15-37 (2011)
An improved procedure has been developed for photodehydrocyclization of stilbenes for the synthesis of phenanthrenes and helicenes. This procedure involves the use of THF as a scavenger of hydriodic acid produced during iodine mediated photodehydrocy
Publikováno v:
Bulletin of the Chemical Society of Japan. 82:1182-1186
An improved method has been developed for photocyclization of stilbene to construct phenanthrenes and benzo[c]phenanthrenes. This reaction is promoted by iodine while tetrahydrofuran is used as an ...
Publikováno v:
Synthetic Communications. 39:3016-3023
A catalyst consisting of polyaniline-anchored metal salts is used as a Lewis acid to promote the Michael reaction of α,β-unsaturated ketones. The reaction is performed efficiently with imidazole, acetyl acetone, and ethyl acetate as Michel donors a
Autor:
Ashutosh V. Bedekar, Harish R. Talele, M. Shyam Sundar, Gilles Muller, Hemant M. Mande, Roberto C. Tovar
Publikováno v:
Tetrahedron letters. 55(10)
A racemic sample of 2,2′,7,7′-tetrahydroxy-1,1′-binaphthyl was resolved with (S)-proline and the separated enantiomers were independently converted to atropisomeric bis-oxazines by aromatic Mannich reaction. These chirally pure oxazines were th