报道了42个6-取代的2,4-二氨基吡啶并[3,2-d]嘧啶(2,4-二氨基-8-脱氮叶酸酯类似物)的合成和生物活性。与以前的经典类似物相比,使用我们先前报告的方法改进后的化合物以更高的产率合成。具体地,S-苯基-; 单-,二-和三甲氧基苯基-; 合成了在N10位置具有H或CH3的单,二和三氯苯基取代的类似物,以及在N10位置具有与CH相同的H,CH3和CH2C的甲基和三氟甲基苯基酮类似物。还合成了S10和N10α-和β-萘基类似物以及N10 CH3类似物。这些化合物被评估为卡氏肺孢子虫(pc)和弓形虫(tg)的二氢叶酸还原酶(DHFR)抑制剂。确定相对于大鼠肝(r1)DHFR作为哺乳动物参考酶的选择性比。针对pcDHFR,对于2,4-二氨基-6-[[(N-甲基-2'-萘基氨基)甲基]吡啶[3,2-d]嘧啶(28),IC50值范围从0.038 x 10-6 M到5.5 x 2,4-二氨基-6
Electron-Deficient Fluoroarene-Mediated Synthesis of Trifluoromethyl Ketones from Carboxylic Acids
作者:Madhukar S. Said、Nilesh S. Khonde、Pradeep Kumar、Jayant M. Gajbhiye
DOI:10.1021/acs.orglett.2c04318
日期:2023.2.24
Fluoroarene-mediated trifluoromethylation of carboxylicacids for the synthesis of trifluoromethyl ketones is disclosed. The fluoroarene activates the acid group and generates the fluoride source in situ for the trifluoromethylation reaction. The present protocol is safe and metal-free, operates under mild reaction conditions, and does not require any external additives to generate trifluoromethyl