New cephalotaxanes, their method of preparation and their use in treatment of cancers, leukemias, parasites including thus resistant to usual chemotherapeutic agents and as reversal agents

Abstract From the Canadian patent

The present invention concerns a compound of formula (I) wherein: W represents O or NH, Q represents an unbranched or branched saturated or unsaturated or , aromatic cyclic or acyclic or heterocyclic hydrocarboned radical containing 1 to 30 carbon atoms including or not heteroatom(s) R1 is H, OH, OMe, O-(C1-, C30)-alkyl, O-aryl-(C1-C30)-alkyl O-(C2-C30)-alkenyl, O-(C3-C30)-cycloalkyl or and R2 is H or OH, or R1, R2 form together -O- R3=R4=OMe or R3 and R4 , form together -OCH2O- R is H, C1-C30alkyl or O-protecting group and R6 represents an unbranched or branched, saturated or unsaturated or aromatic cyclic or acyclic or heterocyclic hydrocarboned radical containing 1 to 30 carbon …