Patent ID: 6867333

Claim:
An α-hydroxy ketone and/or α-hydroxy aldehyde compound of the general formula I: wherein R 1 is selected from the group consisting of H, methyl, CH n F 3-n (n=0-3), ethyl or propyl; B 1 and/or B 2 stands for a single or double bond in the E-(trans) form, Z-(cis) form or E/Z-mixture; or an epoxide as E-(trans) form, Z-(cis) form or E/Z mixture and/or combinations thereof; R 4 is H, methyl, ethyl, CH n F 3-n (n=0-3), or halogen; R 5 is H or PG; Nu is H or alkyl; E is CH 3 , CH 2 OH, CH 2 OPG, CO 2 PG, CO 2 R or CH═O; R is H, methyl or ethyl; and PG designates a conventional protective group for the given coupling atom or the given functional group.