best cofactor-type inhibitor, beta-CH2-TAD (Ki = 0.11 microM). Interestingly, the level of inhibition of horse liver alcohol dehydrogenase by these compounds was found to be much lower (0.1 mM for 1 and 2 and no inhibition up to 10 mM for 3). These findings show that inhibition of tumor-induced inosine monophosphate dehydrogenase type II is selective and may be of therapeutic interest.
噻唑-4-羧酰胺
腺嘌呤二核苷酸(TAD)(1-3)的三个类似物分别在
腺嘌呤核苷的C2'(
核糖和
阿拉伯糖构型)和C3'(
核糖构型)中含有
氟原子。由2'-脱氧-2'-
氟腺苷(9),9-(2-脱氧-2-
氟-β-D-阿拉伯
呋喃糖基)-
腺嘌呤(17)和3的相应5'-单
磷酸盐高收率合成'-deoxy-3'-
氟腺苷(14)。通过将被保护的
噻唑呋喃磷酸化,然后用羰基二
咪唑处理并进行HPLC纯化,获得纯的2',3'-O-异亚丙基-
噻唑呋喃5'-
磷酸咪唑啉(8)。8在
DMF-d7中(由1H和31P NMR监测)中的9与9的反应得到所需的二核苷酸12,在脱异丙基化之后,其收率为82%,为1。在主要产品12的HPLC纯化过程中,还分离出少量对称的二核苷酸AppA(10,7.2%)和TRppTR(11,8.0%)。以类似的方式,通过将8与14和C偶联,得到化合物2和3。分别以80%和76%的收率排名第17位。我们早