Synthesis and preliminary biological evaluation of [11C]methyl (2-amino-5-(benzylthio)thiazolo[4,5-d]pyrimidin-7-yl)-d-leucinate for the fractalkine receptor (CX3CR1)
作者:Mingzhang Gao、Min Wang、Jill A. Meyer、Jonathan S. Peters、Hamideh Zarrinmayeh、Paul R. Territo、Gary D. Hutchins、Qi-Huang Zheng
DOI:10.1016/j.bmcl.2017.04.052
日期:2017.6
methyl (2-amino-5-(benzylthio)thiazolo[4,5-d]pyrimidin-7-yl)-d-leucinate (5) and its precursor 2-amino-5-(benzylthio)thiazolo[4,5-d]pyrimidin-7-yl)-d-leucine (6) were synthesized from 6-amino-2-mercaptopyrimidin-4-ol and BnBr with overall chemical yield 7% in five steps and 4% in six steps, respectively. The target tracer [11C]methyl (2-amino-5-(benzylthio)thiazolo[4,5-d]pyrimidin-7-yl)-d-leucinate ([11C]5)
参考标准(2-氨基-5-(苄硫基)噻唑并[4,5-d]嘧啶-7-基)-d-亮氨酸酯(5)及其前体2-氨基-5-(苄硫基)噻唑并[4]由6-氨基-2-巯基嘧啶丁-4-醇和BnBr合成了(5-d]嘧啶-7-基)-d-亮氨酸(6),总化学产率在5步中为7%,在6步中为4%,分别。由具有[11C]的酸前体制备目标示踪物[11C]甲基(2-氨基-5-(苄硫基)噻唑并[4,5-d]嘧啶-7-基)-d-亮氨酸酯[[11C] 5)。通过[O]-[11C]甲基化制备] CH3OTf,并根据[11C] CO2进行HPLC分离,并与SPE结合以40-50%的放射化学收率,并将衰变校正为轰击结束(EOB)。放射化学纯度> 99%,在EOB处的比活(SA)为370-1110GBq /μmol,从EOB的总合成时间约为40分钟。