752233-12-8

Upstream product

• 51138-53-5 (E)-2-(4-methoxystyryl)-4H-chromen-4-one 
• 205308-05-0 (2Z,4E)-3-Hydroxy-1-(2-hydroxy-phenyl)-5-(4-methoxy-phenyl)-penta-2,4-dien-1-one 

Downstream Products

• 1011791-87-9 3-(4-methoxyphenyl)-2-phenyl-9H-xanthen-9-one 
• 1011792-03-2 3-(4-methoxyphenyl)-2-phenyl-3,4-dihydro-9H-xanthen-9-one 
• 1011791-89-1 2,3-bis(4-methoxyphenyl)-9H-xanthen-9-one 
• 1011792-05-4 2,3-bis(4-methoxyphenyl)-3,4-dihydro-9H-xanthen-9-one 
• 1011792-07-6 2-(3,4-dimethoxyphenyl)-3-(4-methoxyphenyl)-3,4-dihydro-9H-xanthen-9-one 
• 1011791-91-5 2-(3,4-dimethoxyphenyl)-3-(4-methoxyphenyl)-9H-xanthen-9-one 

Relevant academic research and scientific papers

(E)-3-Halo-2-styryl-4H-chromen-4-ones: Synthesis and transformation to novel pyrazoles

New methods for the synthesis of (E)-3-halo-2-styryl-4H-chromen-4-ones were established. The reaction of these compounds with hydrazine hydrate afforded new and unexpected 3(5)-aryl-5(3)-[2-(2-hydroxyphenyl)-2-hydrazonoethyl]-1H- pyrazoles, which upon aci

Efficient syntheses of new polyhydroxylated 2,3-diaryl-9H-xanthen-9-ones

A large number of hydroxylated 2,3-diaryl-9/i-xanthen-9ones have been synthesised by two different approaches, starting either from 3-brom.o-2-m.elhyl-4H-ch:rom.en-4-one or from. (E)-3-brom.o-2-styryl-4H-chrom. en-4-ones. The former method involves Heck r

A novel and efficient route for the synthesis of hydroxylated 2,3-diarylxanthones

A novel, efficient and general route for the synthesis of hydroxylated 2,3-diarylxanthones is described. 3-Bromo-2-styryl-chromone, the key intermediate of this synthesis, is obtained by a Baker-Venkataraman rearrangement of the appropriate 2′-cinnamoylox

Bromination and azidation reactions of 2-styrylchromones. New syntheses of 4(5)-aryl-5(4)-(2-chromonyl)-1,2,3-triazoles

The bromination of 2-styrylchromones, bearing electron neutral substituents, with two molar equivalents of piridinium tribromide gave 2-(2-aryl-1,2-dibromoethyl)chromones and 3-bromo-2-(2-aryl-1,2-dibromoethyl) chromones. The presence of electron-donating substituents on their B ring led to a mixture of compounds due to the higher reactivity of their C(2)=C(3) and Cα=Cβ double bonds, whereas the strongly electron-withdrawing group hindered the bromination. The dehydrobromination of 2-(2-aryl-1,2-dibromoethyl)chromones with triethylamine gave a diastereomeric mixture of (E)- and (Z)-2-(α-bromostyryl)chromones. Some novel 4(5)-aryl-5(4)-(2-chromonyl)-1,2,3-triazoles have been obtained from the reactions of 2-(2-aryl-1,2-dibromoethyl)chromones, 2-(α-bromostyryl) chromones, and 2-styrylchromones with sodium azide. The reactions of 2-styrylchromones with sodium azide are more efficient, general, and constitute a one-pot synthetic method of 4(5)-aryl-5(4)-(2-chromonyl)-1,2,3-triazoles allowing the preparation of 1,2,3-triazoles bearing either electron-donating or electron-withdrawing substituents in their aryl ring. The structure of all new compounds was established by extensive NMR spectroscopic studies. Springer-Verlag 2003.

New syntheses of 4(5)-aryl-5(4)-(2-chromonyl)-1,2,3-triazoles from 2- styrylchromones and sodium azide

The reactions of 2-α-bromostyrylchromones or 2-styrylchromones with sodium azide afforded 4(5)-aryl-5(4)-(2-chromonyl)-1,2,3-triazoles. In the case of 2-α-bromostyrylchromones, the unexpected 1-aryl-5-(2-chromonyl- methyl)tetrazoles have been obtained as minor products and the mechanism of its formation is discussed. The bromination/dehydrobromination reactions of 2-styrylchromones were also studied.