A new simple and convenient method for preparation of oligonucleotides containing a pyrene or a cholesterol moiety

A new simple and convenient approach to the synthesis of oligonucleotides containing pyrene or cholesterol moieties is described. The approach does not require a special phosphoramidite reagent as it is based on Staudinger reaction between an azidoalkyl derivative of either pyrene or cholesterol and a polymer-supported internucleoside 2-cyanoethyl phosphite, which is formed during phosphoramidite condensation.