A. Sakakura et Y. Hayakawa, A facile synthesis of 5 '-end solid-anchored, 3 '-end free oligodeoxyribonucleotides via the (5 '-> 3 ')-elongated phosphoramidite strategy, NUCLEOS NUC, 20(3), 2001, pp. 213-227
It is demonstrated that not only N-2- but also O-6-protection of the guanin
e base is necessary for obtaining the oligodeoxyribonucleotides in high yie
lds and at a high purity in the solid-phase synthesis via the (5 ' --> 3 ')
-chain elongated phosphoramidite approach.