Studies on biologically active nucleosides and nucleotides. 5. Synthesis and antitumor activity of some 2,2'-anhydro-1-(3',5'-di-O-acyl-.beta.-D-arabinofuranosyl)cytosine salts and 2,2'-anhydro-1-(3'-O-acyl-.beta.-D-arabinofuranosyl)cytosine 5'-phosphates
substituents on the ester side chains (4--16) have been synthesized. The synthesis of these diesters involved the reaction between cytidine and the corresponding acid anhydride or acid chloride in the presence of boron trifluoride etherate. Similar reaction of bis(cytidine 5'-)suberate (21) with pivaloyl chloride gave bis[2,2'-anhydro-1-(3'-O-pivaloyl-beta-D-arabinofuranosyl)cytosine 5'-]suberate dihydrochloride