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- W2053252413 abstract "Abstract Reactions of 3-formylchromones with benzyl carbamate and triphenyl phosphite in acetic acid lead to the corresponding diphenyl chromone-3-[α(-N-benzyloxycarbonyl)amino]-methanephosphonates 2 in high yields. Deprotection of the Z-substituted diphenyl esters 2 by means of acetic hydrogen bromide solution and the subsequent hydrolysis by means of 20% aq. HCI, lead to the final chromone-3-(α-amino)methanephosphonic acids 4. Attempts of synthesis of the corresponding chromone-2- aminophosphonic derivatives by this way, have failed. On the other hand, chromone-2-(α-amino)methanephosphonic acid (6) was successfully obtained by an addition of tris(trimethylsilyl) phosphite to the aldimine, which was formed from the 2-formylchromone." @default.
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- W2053252413 date "1998-12-01" @default.
- W2053252413 modified "2023-10-18" @default.
- W2053252413 title "AMINOPHOSPHONIC DERIVATIVES OF CHROMONE. SYNTHESIS OF NOVEL CHROMONE-3-(α-AMINO) METHANEPHOSPHONIC ACIDS" @default.
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- W2053252413 doi "https://doi.org/10.1080/10426509808045496" @default.
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