- THREE CHROMONES FROM BULBS OF PANCRATIUM BIFLORUM
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Two polyoxygenated chromones, 5,7-dihydroxy-2-methylchromone (1) and 5,6-dihydroxy-7-methoxy-2-methylchromone (2), and a glucosyloxychromone, 7-glucosyloxy-5-hydroxy-2-methylchromone (3), have been isolated from an extract of the bulbs of Pancratium biflorum collected when the plants were in flower.The compounds were characterized by chemical transformation, comprehensive spectral evidence and synthesis. 2 and 3 are naturally occurring chromones, while 1 has been detected only once before in Daucus carota roots, as a stress metabolite. - Key Word Index: Panacratium biflorum; Amaryllidaceae; bulb; polyoxygenated chromones; 5,7-dihydroxy-2-methylchromone; 5,6-dihydroxy-7-methoxy-2-methylchromone; glucosyloxychromone; 7-glucosyloxy-5-hydroxy-2-methylchromone; chromone-metal complex.
- Ghosal, Shibnath,Singh, Shripati,Bhagat, Mahendra P.,Kumar, Yatendra
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- Total synthesis of chaetoquadrins A-C
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The first total synthesis of the monoamine oxidase inhibitors chaetoquadrins A-C has been accomplished. Key steps in the synthesis include an aromatic Claisen rearrangement, asymmetric boron aldol reaction and acid-mediated spiroketalization. Comparison o
- Kim, U Bin,Furkert, Daniel P.,Brimble, Margaret A.
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p. 658 - 661
(2013/04/10)
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- Cytotoxic and HIF-1α inhibitory compounds from Crossosoma bigelovii
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Cytotoxicity-guided fractionation of an organic solvent extract of the plant Crossosoma bigelovii led to the discovery of a new strophanthidin glycoside (1) and tw new 2-methylchromone glycosides (2 and 3). Also isolated were the known chromones eugenin a
- Klausmeyer, Paul,Zhou, Qin,Scudiero, Dominic A.,Uranchimeg, Badarch,Melillo, Giovanni,Cardellina, John H.,Shoemaker, Robert H.,Chang, Ching-Jer,McCloud, Thomas G.
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p. 805 - 812
(2009/12/26)
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