Patent ID: 7297788

Claim:
A compound of formula I wherein R 1 , R 2 are each independently selected from H, OH or OPr; or R 1 and R 2 together are O—X 1 —O; R 3, R 4 are each independently selected from H, OH or OPr; or R 3 and R 4 together are O—X 2 —O; R 5 and R 6 together are ═O or R 5 is selected from H, OH, OPr or R 5 and R 3 together are O—X 3 —O or R 5 and R 2 together are O—X 4 —O and R 6 is selected from hydrogen, cyano, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted aryl, substituted or unsubstituted heterocyclyl, with the proviso that at least one of R 1 , R 2 , R 3 , R 4 or R 5 is OH or OPr; Pr is an hydroxy protecting group which can be the same or different on each of R 1 , R 2 , R 3 , R 4 or R 5 ; X 1 X 2 , X 3 and X 4 are each independently a divalent hydroxyl protecting group; the dotted line represents a single or double bond with the proviso that when both R 1 and R 2 , or R 3 and R 4 , are H then there is a double bond between the two C to which the H are linked; Z is —(CRaRb) n — wherein n is 1, and Ra and Rb are each independently selected from hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted aryl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted alkoxy, substituted or unsubstituted aryloxy, substituted or unsubstituted amino or halogen; Y is selected from —O—, —S—, or —C(O)—; W is a group selected from substituted or unsubstituted arylalkyl, substituted or unsubstituted heterocyclylalkyl, substituted or unsubstituted alkenyl; or a salt thereof.