42059-76-7

Upstream product

• 22362-66-9 3,5-dibromo-2-hydroxyacetophenone 
• 68-12-2 N,N-dimethyl-formamide 

Downstream Products

• 1162661-55-3 ethyl 3-(5-(3,5-dibromo-2-hydroxybenzoyl)-2-hydroxyphenyl)-3-oxopropanoate 
• 1203451-88-0 ethyl 3-chloro-5-(3,5-dibromo-2-hydroxybenzoyl)-2-hydroxybenzoate 
• 1208121-60-1 7-(3',5'-dibromo-2'-hydroxybenzoyl)-5,6-dimethoxycarbonyl-2,3-dimethyl-8-formyl-5H-[1,3]thiazolo[3,2-a]pyridine 
• 1355043-35-4 3-(3,5-Dibromo-2-hydroxybenzoyl)-7,12-dihydro-6H-indolo[2,3-a]quinolizine-1,12b-dicarboxylic acid dimethyl ester 
• 1448991-95-4 C₂₈H₂₄Br₂N₂O₆ 
• 1448991-98-7 C₂₇H₂₂Br₂N₂O₇ 
• 1449215-83-1 2-{[(6,8-dibromo-2-ethoxy-4-oxo-2H-chromen-3(4H)-ylidene)methyl]amino}benzenesulfonamide 
• 1544458-48-1 (3,5-dibromo-2-hydroxyphenyl)(7-isopropyl-2-methyl-4,7-dihydropyrazolo[1,5-a]pyrimidin-6-yl)methanone 
• 1544458-49-2 (7-(tert-butyl)-2-methyl-4,7-dihydropyrazolo[1,5-a]pyrimidin-6-yl)(3,5-dibromo-2-hydroxyphenyl)methanone 
• 1544458-52-7 (3,5-dibromo-2-hydroxyphenyl)(7-ethyl-2-methyl-4,7-dihydropyrazolo[1,5-a]pyrimidin-6-yl)methanone 
• 1544457-60-4 (3,5-dibromo-2-hydroxyphenyl)(2-methylpyrazolo[1,5-a]pyrimidin-6-yl)methanone 
• 1613266-16-2 C₂₄H₁₈Br₂N₂O₇ 

Relevant academic research and scientific papers

Diels-Alder reactions of chromone-3-carboxaldehydes with ortho-benzoquinodimethane. New synthesis of benzo[b]xanthones

An efficient new route to the benzo[b]xanthone system has been developed and applied to the synthesis of several new derivatives. The cycloaddition reactions of chromone-3-carboxaldehydes 12, reacting as dienophiles, with ortho-benzoquinodimethane 7 gave a diastereomeric mixture of cycloadducts 8 and 9. The formation of these compounds results from the Diels-Alder reactions of 12 and 7 followed by the in situ deformylation. The oxidation of adducts 8 and 9 with dimethyl sulfoxide in the presence of iodine gave the novel benzo[b]xanthones 11 in good yields.

2-Hydroxy Ketones, V. --- Preperation of Substituted Chromones

Various 2-hydroxyacetophenone derivatives react with Vilsmeier reagent according to the Harnisch method to give the substituted chromones 2b-i, which have been identified by elemental analyses and IR and 1H-NMR spectra.