Nucleoside conjugates. 7. Synthesis and antitumor activity of 1-.beta.-D-arabinofuranosylcytosine conjugates of ether lipids

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Abstract
Three new 1-.beta.-D-arabinofuranosylcytosine conjugates of ether lipids (alkyl glycerols) linked by a pyrophosphate diester bond have been prepared and evaluated against mouse leukemia L1210 and P388. These include ara-CDP-rac-1-O-hexadecyl-2-O-palmitoylglycerol (9a) (ara-CDP = 1-.beta.-D-arabinofuranosylcytosine 5''-diphosphate), ara-CDP-rac-1-O-octadecyl-2-O-palmitoylglycerol (9b), and ara-CDP-rac-1-O-octadecyl-2-O-methylglycerol (9c). Among them, conjugate 9a produced significant increase in life span (200-293%) in mice bearing ip and ic implanted L1210 lymphoic leukemia at a total dose of 400-500 mg (406-508 .mu.mol/kg). Significant schedule dependence was not observed when the conjugate was given ip once daily on day 1, days 1, 5, and 9, and days 1-5. The new conjugates are water soluble by sonication.