Antimitotic halogenated derivative of Vinca alkaloid

摘要

Antimitotic Vinca alkaloid derivatives of formula (I), their salts with acids, and their diastereoisomers and mixtures, and processes for their preparation are new. In formula (I), n = 1 or 2, R1 = H or F; R2 = Cl. Process for the preparation of vinflunine (I; n = 2; R1 = H; R2 = difluoro), by reaction of (II) in a superacid medium (HF + SbF5) at -45 to -35[deg]C, with a halide generator (chloroform, 2,2-dichloropropane, carbon tetrabromide, dibromomethane, or boron tribromide) is also claimed, where R3 = OH; R4 = H, or R3 and R4 together form a double bond.