34086-56-1

Upstream product

• 186581-53-3 diazomethane 
• 34086-50-5 alpinumisoflavone 
• 27762-87-4 5-hydroxy-3(4'-methoxy)phenyl-8,8-dimethyl-4H,8H-benzo<1,2b:5,4b'>dipyran-4-one 
• 77-78-1 dimethyl sulfate 
• 114090-97-0 2-carbethoxy-5-hydroxy-3-(4'-methoxy)phenyl-8,8-dimethyl-6,7-dihydro-4H,8H-benzo<1,2b:5,4b'>dipyran-4-one 
• 114090-99-2 5-hydroxy-3-(4'-methoxy)phenyl-8,8-dimethyl-6,7-dihydro-4H,8H-benzo<1,2b:5,4b'>dipyran-4-one-2-carboxylic acid 
• 57261-40-2 1-(5,7-Dihydroxy-2,2-dimethyl-chroman-6-yl)-2-(4-methoxy-phenyl)-ethanone 
• 27763-00-4 5-hydroxy-3-(4'-methoxy3)phenyl-8,8-dimethyl-6,7-dihydro-4H,8H-benzo<1,2b:5,4b'>dipyran-4-one 
• 141737-71-5 7-Benzyloxy-6-[(E)-3-(4-benzyloxy-phenyl)-acryloyl]-5-methoxy-2,2-dimethyl-chroman-4-one 
• 141737-59-9 6-[(E)-3-(4-Benzyloxy-phenyl)-acryloyl]-7-hydroxy-5-methoxy-2,2-dimethyl-chroman-4-one 
• 141737-74-8 7-(4-hydroxyphenyl)-2,3-dihydro-5-methoxy-2,2-dimethyl-4H,6H-benzo<1,2-b:5,4-b'>dipyran-4,6-dione 
• 141737-80-6 6-Hydroxy-3-(4-hydroxy-phenyl)-5-methoxy-8,8-dimethyl-7,8-dihydro-6H-pyrano[3,2-g]chromen-4-one 
• 141737-82-8 4'-hydroxy-5-methoxy-2'',2''-dimethylpyrano[5'',6'':6,7]isoflavone 
• 124360-59-4 6-acetyl-7-hydroxy-5-methoxy-2,2-dimethyl-4-chromanone 

Downstream Products

• 27762-87-4 5-hydroxy-3(4'-methoxy)phenyl-8,8-dimethyl-4H,8H-benzo<1,2b:5,4b'>dipyran-4-one 

Relevant academic research and scientific papers

SYNTHESIS OF 4',5- AND 3',4',5-OXYGENATED PYRANOISOFLAVONES: ALPINUM ISOFLAVONE AND RELATED COMPOUNDS, AND REVISED STRUCTURE OF DERRONE

Alpinumisoflavone (4',5-dihydroxy-2",2"-dimethylpyranoisoflavone) (1a) was synthesized by regioselective reduction of 7-(4-hydroxyphenyl)-2,3-dihydro-5-methoxy-2,2-dimethyl-4H,6H-benzodipyran-4,6-dione (15a) with NaBH4 and dehydrati

SYNTHESIS OF ALPINUM ISOFLAVONE, DERRONE AND RELATED PYRANOISOFLAVONES

Reaction of phenacylchroman 1 with ethoxyalyl chloride in pyridine followed by hydrolysis of the resulting esters 2 and 3 and decarboxylation of the acids 4 and 5, gave dihydro-4'-O-methyl alpinum isoflavone 6 and 4'-O-methylderrone 7 respectively.Similarly 8 gave 11 which was selectively demethylated to 7.DDQ, dehydrogenation of 6, 7 and 11 gave 14, 15 and 17.Demethylation of 6 and 7 followed by dehydrogenation gave alpinum isoflavone 18 and derrone 19.

THONNINGINE-A AND THONNINGINE-B: TWO 3-PHENYLCOUMARINS FROM THE SEEDS OF MILLETTIA THONNINGII

Key Word Index - Millettia thonningii; Leguminosae; isoflavones; 3-phenylcoumarins; robustic acid; thonningine-A; thonningine-B. The seeds of Millettia thonningii have yielded four isoflavones and three 4-hydroxy-3-phenylcoumarins, of which two are novel.On the basis of spectral analyses the novel compounds have been identified as 4-hydroxy-5,8-dimethoxy-3-(3',4'-methylenedioxy)phenyl-2''-isopropenylfurano(4'',5'',6,7)coumarin (thonningine-A) and 4-hydroxy-5,8-dimethoxy-3-(4'-methoxy)phenyl-2''-isopropenylfurano(4'',5'',6,7)coumarin (thonningine-B).

A PYRANO-ISOFLAVONE FROM SEEDS OF MILLETIA THONNINGII

Extraction of the seeds of Milletia thonningii gave alpinumisoflavone, its monomethyl and dimethyl derivatives, robustic acid and a new pyrano-isoflavone.The structure of the latter was established by chemical transformation and spectroscopic means. - Key