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Two new examples of a carbon→oxygen ethoxycarbonyl group shift are described. Treatment of 3-ethoxycarbonylnitromethyl-1,2- O -isopropylidene-6- O - p -toluenesulfonyl-α- d -allofuranose ( 4 ) with Bu 4 NF leads to a rearrangement to 5- O -ethoxycarbonyl-1,2- O -isopropylidene-3-nitromethyl-6-...
It is possible to synthesize poly(N-substituted maleimide) by using a chiral complex consisting of a zinc and N -diphenylmethyl-1-benzyl-2-pyrrolidinoethanamine (DPhBP). The optical specific rotations ( α ) 435 25 in obtained polymers depend on the chirality of ligands in the catalysts. In the...
The stereoselectivity, periselectivity, and regioselectivity in the cycloaddition reactions of 8-( p -chlorophenyl)-8-azaheptafulvene with cyclopentadiene and symmetrical/unsymmetrical fulvenes is described.
Starting from fluoropyrazine, a general synthetic route including metallation and palladium-catalyzed cross-coupling reactions is described to access to rod-like alkylaryl or diarylpyrazines. Among them, some have liquid crystalline properties.
Starting with 2-acetylquinoxaline a novel class of heterocyclic compounds, the 1-(thiazol-2-yl)-1 H -pyrazolo(3,4- b )quinoxalines 4 , were prepared by following two different synthetic procedures: 2-acetylquinoxaline reacted with thiosemicarbazide to the thiosemicarbazones 1a which was (i)...
6-Acetoxy-4-alkenyl arenes undergo regio- and stereoselective intramolecular Friedel–Crafts reaction affording benzocycles in moderate to excellent yields in TFA/HOAc (3:1). It was observed that introduction of alkyls or phenyl group to the allylic acetate moiety facilitates the cyclization...
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