Beilstein J. Org. Chem.2021,17, 1374–1384, doi:10.3762/bjoc.17.96
properties (absorption and emission) for these versatile systems has been revealed.
Keywords: Clauson–Kaas reaction; heterocycles; ring-closing metathesis; truxene; Ullmann-type coupling; VanLeusenreaction; Introduction
The two-dimensional phenylene-based π-conjugated star-shaped architectures has
bisoxazole truxene derivative 21 by virtue of VanLeusenreaction as a key step (Scheme 6). To this context, we first treated the hexabutylated derivative 2 with 1,1-dichlorodimethyl ether acting as a formyl source in the presence of Lewis acid such as titanium tetrachloride (TiCl4) in Rieche manner to yield
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Graphical Abstract
Scheme 1:
Retrosynthetic pathways to the pyrrole-based C3-symmetric truxene derivative 6.
Beilstein J. Org. Chem.2014,10, 2222–2229, doi:10.3762/bjoc.10.230
the vanLeusenreaction from trans-3-(2-vinylphenyl)acrylaldehyde which is prepared from o-vinylbenzaldehyde and (formylmethylene)triphenylphosphorane. The 4- and 5-(2-vinylstyryl)oxazoles afford, by photochemical intramolecular cycloaddition, diverse fused oxazoline-benzobicyclo[3.2.1]octadienes
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Graphical Abstract
Scheme 1:
Synthesis of 4- (1) and 5-(2-vinylstyryl)oxazoles (2).