Sakakura A, Hayakawa Y
Laboratory of Bioorganic Chemistry, Graduate School of Human Informatics, Nagoya University, Chikusa, Japan.
Nucleosides Nucleotides Nucleic Acids. 2001 Mar;20(3):213-27. doi: 10.1081/NCN-100002082.
It is demonstrated that not only N2- but also O6-protection of the guanine base is necessary for obtaining the oligodeoxyribonucleotides in high yields and at a high purity in the solid-phase synthesis via the (5'--> 3')-chain elongated phosphoramidite approach.