1,3,4-Thiadiazole derivatives having a partial structure of 2-ethylsulfonyl-7-methyl-5H-1,3,4-thiadiazolo[3,2-a]pyrimidin-5-one (TPSO2-2) were synthesized, and their chemical reactivities and biological activities were investigated. TPSO2-2 readily reacted with SH compounds and showed a high inhibitory effect against “SH enzyme,” but 2-acetylamino-5-ethylsulfonyl-1,3,4-thiadiazole (AEST), a TPSO2-2 analog without a pyrimidine structure, did not react with those compounds and showed a smaller inhibitory effect against the enzyme. Furthermore, TPSO2-2 showed a strong anti-yeast activity, while AEST did not. It is presumed that not only the electron-withdrawing sulfonyl group at the 2-position but also the pseudopurine skeleton appear to be responsible for revealing the biological and chemical activities of TPSO2-2.
合成了具有部分结构的1,3,4-
噻二唑衍
生物,结构为2-乙基磺酰基-7-甲基-5H-1,3,4-
噻二唑[3,2-a]
嘧啶-5-酮(TPSO2-2),并研究了它们的
化学反应性和
生物活性。TPSO2-2易于与巯基化合物反应,并对“巯基酶”表现出较强的抑制作用,而缺乏
嘧啶结构的TPSO2-2类似物2-乙酰
氨基-5-乙基磺酰基-1,3,4-
噻二唑(AEST)则未与这些化合物发生反应,对酶的抑制作用也较小。此外,TPSO2-2具有较强的抗酵母活性,而AEST则没有。推测在2位的电子吸引磺酰基和伪
嘌呤骨架不仅与TPSO2-2的
生物活性和
化学活性有关。