abstract |
The invention relates to a method for preparing a compound of formula (I) in which: R<SUB>1</SUB>, R<SUB>2</SUB>, R<SUB>3</SUB>, while being identical or different, are protective groups and Nu is a nucleophilic group, to a method in which a nucleophilic compound is reacted on a compound (II), in which R<SUB>1</SUB>, R<SUB>2</SUB>, R<SUB>3</SUB> are defined as above, and Y represents a leaving group. |