Three classes of novel inhibitors of inosine monophosphate dehydrogenase have been prepared and their anti-proliferative properties were evaluated against several cancer cell lines.(1) Mycophenolic adenine dinucleotide analogues (8-13) containing a substituent at the C2 of adenine ring were found to be potent inhibitors of IMPDH (K-i's in range of 0.6-82 nM) and sub-mu M inhibitors of leukemic K562 cell proliferation. (2) Mycophenolic adenosine (D and L) esters (20 and 21) showed a potent inhibition of IMPDH2 (K-i = 102 and K-i = 231 nM, respectively) and inhibition of K562 cell growth (IC50 = 0.5 and IC50 = 1.6 mu M). These compounds serve both as inhibitors of the enzyme and as a depot form of mycophenolic acid. The corresponding amide analogue 22, also a potent inhibitor of IMPDH (K-i = 84 nM), did not inhibit cancer cell proliferation. (3) Mycophenolic-(L)-and (D)-valine adenine diamide derivatives 25 (K-i = 9 nM) and 28 (K-i = 3 nM) were found to be very potent enzymatically, but did not inhibit proliferation of cancer cells. (C) 2013 Elsevier Ltd. All rights reserved.
Three classes of novel inhibitors of inosine monophosphate dehydrogenase have been prepared and their anti-proliferative properties were evaluated against several cancer cell lines.(1) Mycophenolic adenine dinucleotide analogues (8-13) containing a substituent at the C2 of adenine ring were found to be potent inhibitors of IMPDH (K-i's in range of 0.6-82 nM) and sub-mu M inhibitors of leukemic K562 cell proliferation. (2) Mycophenolic adenosine (D and L) esters (20 and 21) showed a potent inhibition of IMPDH2 (K-i = 102 and K-i = 231 nM, respectively) and inhibition of K562 cell growth (IC50 = 0.5 and IC50 = 1.6 mu M). These compounds serve both as inhibitors of the enzyme and as a depot form of mycophenolic acid. The corresponding amide analogue 22, also a potent inhibitor of IMPDH (K-i = 84 nM), did not inhibit cancer cell proliferation. (3) Mycophenolic-(L)-and (D)-valine adenine diamide derivatives 25 (K-i = 9 nM) and 28 (K-i = 3 nM) were found to be very potent enzymatically, but did not inhibit proliferation of cancer cells. (C) 2013 Elsevier Ltd. All rights reserved.