Epimerization of 4'-C bond and modification of 14-CH3-(CO)-fragment in anthracyclin antibiotics

摘要

A method of synthesizing R1, R2-substituted-4' (ax. or eq.)-OH anthracyclines and their corresponding salts of Formula (1) from daunorubicin or N-Trifluoroacetyl-4-R1-derivatives of daunorubicin, wherein R1 is defined as H, OH, and 4'-HO is defined as ax[ial]. The method includes producing N-Trifluoroacetyl daunorubicin and treating the N-Trifluoroacetyldaunorubicin or N-Trifluoroacetyl-4-R₁-derivatives of daunorubicin, wherein R₁ is defined as H, OH, with dimethylsulfoxide activated by different acylating agents. The attained intermediate product is then treated with a strong base (ex. tertiary amines) resulting in the 4'-keto-N-Trifluoroacetyl-4-R₁ daunorubicin wherein R₁ is defined as H, OH, OMe. The 4'-keto-N-Trifluoroacetyl-4-R₁-daunorubicin is reacted with a reducing agent, a derivative of a borohydride of an alkaline metal MHBL₃ , to produce N-Trifluoroacetyl-4'-epi-4-R₁-daunorubicin. The N-Trifluoroacetyl-4'-epi-4-R₁-daunorubicin undergoes hydrolysis in a basic solution to produce a derivate of an anthoacyclin which is halogenized [by complex halogenides] to form a 14-Hal-derivative. This result is then hydrolyzed by well-known methods in the presence of a formate of an alkaline metal to form the desired final compound.