Synthesis of isotope-labeled HSP90 inhibitor: [<sup>13</sup>CD<sub>3</sub>] and [<sup>14</sup>C]-TAK-459
作者:Mihaela Plesescu、Eric L. Elliott、Yuexian Li、Shimoga R. Prakash
DOI:10.1002/jlcr.3217
日期:2014.7
[13CD3]-TAK-459 (1A), an HSP90 inhibitor, was synthesized from [13CD3]-sodium methoxide in three steps in an overall yield of 29%. The key intermediate [13CD3]-2-methoxy-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine was synthesized in two steps from 2,6-dibromopyridine and stable isotope-labeled sodium methoxide. [14C]-TAK-459 (1B) was synthesized from [14C(U)]-guanidine hydrochloride in five steps in an overall radiochemical yield of 5.4%. The key intermediate, [14C]-(R)-2-amino-7-(2-bromo-4-fluorophenyl)-4-methyl-7,8-dihydropyrido[4,3-d]pyrimidin-5(6H)-one, was prepared by microwave-assisted condensation.
HSP90抑制剂[13CD3]-TAK-459 (1A)由[13CD3]-甲醇钠通过三步合成,总收率为29%。关键中间体[13CD3]-2-甲氧基-6-(4,4,5,5-四甲基-1,3,2-二氧硼戊环-2-基)吡啶由2,6-二溴吡啶和稳定同位素标记的甲醇钠通过两步合成。[14C]-TAK-459 (1B)由[14C(U)]-盐酸胍通过五步合成,总放射化学收率为5.4%。关键中间体[14C]-(R)-2-氨基-7-(2-溴-4-氟苯基)-4-甲基-7,8-二氢吡啶并[4,3-d]嘧啶-5(6H)-酮通过微波辅助缩合制备。