cas 16981-20-7, 5,7-Dihydroxy-8-(3-methyl-2-butenyl)-6-(2-methylpropanoyl)-4-phenyl-2H-1-benzopyran-2-one | Articles data ｜lookchem

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16981-20-7

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Synthesis of Mammea Coumarins. Part 1. The Coumarins of the Mammea A, B, and C Series
The naturally-occuring Mammea coumarins of the 4-phenyl-(mammea A), propyl-(mammea B), and 4-pentyl-(mammea C) series have been prepared by Pechmann condensation of an acylphloroglucinol (3-methylbutyryl-, 2-methylbutyryl-, butyryl-, or 2-methylpropionyl-) with the appropriate β-ketoester to give a mixture of 6- and 8-acyl-5,7-dihydroxycoumarins that could be separated.C-Alkylation with 3-methylbut-2-enyl bromide, or 3,7-dimethylocta-2,6-dienyl chloride, in aqueous potassium hydroxide completed the synthesis of the Mammea coumarins having unmodified prenyl or geranyl substituents; oxidative modification of the prenyl group led to the mammea cyclo E and cyclo F coumarins.Some mammea cyclo D (chromeno) coumarins were synthesized by reaction of acylcoumarins with 1,1-dimethoxy-3-methylbutan-3-ol.
Crombie, Leslie,Jones, Raymond C. F.,Palmer, Christopher J.
p. 317 - 332
(2007/10/02)

Synthesis of mammeins and surangin A
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Crombie,Jones,Palmer
p. 2929 - 2932
(2007/10/02)

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Chemical Properties

Melting Point: 171℃
Boiling Point: 599.9°C at 760 mmHg
Flash Point:206.8°C
Density: 1.238g/cm³
Vapor Pressure: 5.49E-15mmHg at 25°C
PSA: 87.74000
LogP: 5.21860

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