- SYNTHESIS OF EPIRUBICIN FROM 13-DIHYDRODAUNORUBICINE
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A method of preparing an anthracyclin such as epirubicin from a starting material comprising 13-dihydrodaunorubicine (13-daunorubicinol). The method comprises producing N-Trifluoroacetyl-13-daunorubicinol from 13-daunorubicinol by acylation. The N-Trifluoroacetyl-13-daunorubicinol is reacted with an aprotic solvent and an acylating agent to produce an intermediate sulfoxy salt which is treated with a strong base to produce 4′-keto-N-Trifluoroacetyldaunorubicin. The 4′-keto-N-Trifluoroacetyldaunorubicin is reacted with a reducing agent, such as borohydride of an alkaline metal, to produce N-Trifluoroacetyl-4′-epi-daunorubicin. The N-Trifluoroacetyl-4′-epi-daunorubicin is hydrolyzed in a basic solution to produce an intermediate compound. The intermediate compound is reacted with a halogenizing agent to produce a 14-Hal-derivative. The 14-Hal derivative is hydrolized in the presence of a formate of an alkaline metal to produce the desired final compound.
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Page/Page column 6
(2008/06/13)
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- Process for the preparation of 4'-epidaunorubicin, 3',4'-diepidaunorubicin, their doxorubicin analogs, and intermediates used in said process
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Disclosed is a process for preparing the known antitumor glycosides: 4'-epidaunorubicin, 3',4'-diepidaunorubicin, and their doxorubicin analogs by oxidizing the C-4' hydroxyl group of N-protected daunorubicin to form certain novel intermediates having a 4'-keto configuration, followed by reduction of the keto group with NaBH4 and mild alkaline hydrolysis to remove the N-protecting acyl groups.
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- SUBSTITUTIONS D'ESTERS ALLYLIQUES: PREPARATION DE GLYCALS AMINES EN C-3 ET ETUDE DE LEUR GLYCOSIDATION ACIDO-CATALYSEE. APPLICATION A L'HEMISYNTHESE DE GLYCOSIDES DU GROUPE DES ANTHRACYCLINES
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3-Amino-1,5-anhydro-2,3,6-trideoxy-L-arabino- and -L-ribo-hex-1-enitol were prepared by substitution of the allylic ester function of 1,5-anhydro-3,4-di-O-benzoyl-2,6-dideoxy-L-arabino-hex-1-enitol with sodium azide, followed by reduction with lithium aluminium hydride.Glycosidation was performed with various alcohols, in particular daunomycinone.In the latter case, the partial synthesis of 4'-epi- and 3',4'-epi-daunorubicines was accomplished in three major steps.
- Boivin, J.,Pais, M.,Monneret, C.
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p. 193 - 204
(2007/10/02)
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- HEMISYNTHESE DE NOUVEAUX GLICOSIDES ANALOGUES DE LA DAUNORUBICINE
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Seven daunorubicin analogs containing α-L-, α-D-, and β-D-glicosidic linkages, in which the natural occuring sugar (L-daunosamine) was replaced by diastereomeric 3-amino-2,3,6-trideoxyhexoses (3-epi-L-daunosamine, D-acosamine, D-daunosamine, D-ristosamine, and 3-epi-D-daunosamine), were prepared.In all cases, glycosidation with daunomycinone was performed in the presence of p-toluenesulfonic acid starting from 1-O-acetyl-2,3,6-trideoxy-4-O-p-nitrobenzoyl-3-trifluoro-acetamidohexopyranoses (prepared from the corresponding methyl 3-amino-2,3,6-trideoxyhexopyranosides) or from 1,5-anhydro-2,3,6-trideoxy-4-O-p-nitrobenzoyl-3-trifluoroacetamidohex-1-enitols (prepared from glycosals or pseudoglycals, the 3-amino group being introduced by substitution with sodium azide and subsequent reduction).Glycosidation was followed by removal of the protecting groups.
- Boivin, Jean,Montagnac, Alain,Monneret, Claude,Pais, Mary
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p. 223 - 242
(2007/10/02)
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