A rapid nucleophilic displacement reaction of 6-chloropurine, 2-amino-6-chloropurine and 5- bromocytosine with various nucleophiles under focused microwave irradiation is described. Using this method, the desired products were obtained with the yields up to 99% in a short reaction time.
[Alves, M. Jose; Carvalho, M. Alice; Carvalho, Silvia; Dias, Alice M.; Fernandes, Francisco H.; Proenca, M. Fernanda European Journal of Organic Chemistry, 2007 , # 29 p. 4881 - 4887]