Synthesis and Biological Evaluation of α-Halogenated Bisphosphonate and Phosphonocarboxylate Analogues of Risedronate
作者:Mong S. Marma、Zhidao Xia、Charlotte Stewart、Fraser Coxon、James E. Dunford、Rudi Baron、Boris A. Kashemirov、Frank H. Ebetino、James T. Triffitt、R. Graham G. Russell、Charles E. McKenna
DOI:10.1021/jm0702884
日期:2007.11.1
alpha-Halogenated. analogues of the anti-resorptive bisphosphonate risedronate (5, Ris) and its phosphonocarboxylate cognate (7, 3-PEHPC were synthesized and compared with 5, 7, and the corresponding desoxy analogues in bone mineral affinity and mevalonate pathway inhibition assays. The Ris (5e-h) and 3-PEHPC (7e-h) analogues had decreased bone mineral affinity, confirming that the alpha-OH group in 5 and 7 enhances bone affinity. The 5 alpha-halo-analogues potently inhibited farnesyl pyrophosphate synthase (FPPS) with IC50 values from 16 ((alpha-F) to 340 (alpha-Br) nM (5, 6 nM). In contrast, 7 alpha-halo-analogues were ineffective versus FPPS (IC50 > 600 mu M), but inhibited Rab geranylgeranyl transferase (RGGT) IC50 = 16-35 mu M) similarly to 7 itself (IC50 = 24 mu M). The alpha-F analogue 7e was 1-2 times as active as 7 in J774 cell viability and Rab11 prenylation inhibition assays.
The McKenna reaction – avoiding side reactions in phosphonate deprotection
作者:Katarzyna Justyna、Joanna Małolepsza、Damian Kusy、Waldemar Maniukiewicz、Katarzyna M Błażewska
DOI:10.3762/bjoc.16.119
日期:——
The McKenna reaction is a well-known and popular method for the efficient and mild synthesis of organophosphorus acids. Bromotrimethylsilane (BTMS) is the main reagent in this reaction, which transforms dialkyl phosphonateesters into bis(trimethylsilyl)esters, which are then easily converted into the target acids. However, the versatile character of the McKenna reaction is not always used to its full