The benzyl and methyl triesters of cAMP were synthesized from cAMP tri-n-butylammonium salt by alkylation with alkyl halides in the presence of Na2CO3 in dimethylacetamide (DMA).
Furuta, Toshiaki; Torigai, Hiromi; Osawa, Tomoko, Journal of the Chemical Society. Perkin transactions I, 1993, # 24, p. 3139 - 3142