survival. To improve the potency of lead PDI inhibitor BAP2 (( E)-3-(3-(4-hydroxyphenyl)-3-oxoprop-1-en-1-yl)benzonitrile), we designed and synthesized 67 analogues. We determined that PDI inhibition relied on the A ring hydroxyl group of the chalcone scaffold and cLogP increase in the sulfonamide chain improvedpotency. Docking studies revealed that BAP2 and analogues bind to His256 in the b' domain of
蛋白质二硫键异构酶 (PDI) 负责内质网 (ER) 中的新生蛋白质折叠,对胶质母细胞瘤的存活至关重要。为了提高 PDI 抑制剂 BAP2 (( E)-3-(3-(4-hydroxyphenyl)-3-oxoprop-1-en-1-yl)benzonitron) 的效力,我们设计并合成了 67 种类似物。我们确定 PDI 抑制依赖于查耳酮支架的 A 环羟基,并且磺酰胺链中 cLogP 的增加提高了效力。对接研究表明,BAP2 和类似物与 PDI 的 b' 结构域中的 His256 结合,而 His256 突变为 Ala 会消除 BAP2 类似物的活性。BAP2 和优化的类似物 59 具有适度的硫醇反应性;然而,我们建议 BAP2 类似物对 PDI 的抑制取决于 b' 结构域。重要的是,类似物抑制胶质母细胞瘤细胞生长,诱导 ER 应激,增加 G2M 检查点蛋白的表达,降低 DNA 修复蛋白的表达。总的来说,我们的结果支持抑制
Catalytic Asymmetric Deoxygenative Cyclopropanation Reactions by a Chiral Salen-Mo Catalyst
The catalytic asymmetriccyclopropanation reaction of alkenes with diazo compounds is a direct and powerful method to construct chiral cyclopropanes that are essential to drug discovery. However, diazo compounds are potentially explosive and often require hazardous reagents for their preparation. Here, we report on the use of 1,2-dicarbonyl compounds as safe and readily available surrogates for diazo
transformation of an oxindole core into a quinolinone skeleton, which generates several structurally new pyridine-fused quinolinones. The synergistic reactions allow expansion of a five-membered lactam ring by radical cation-triggered C–C bondcleavage and enable a further intramolecular cyclization with the aim to construct totally distinct core skeletons.
π-Lewis basic palladium (0) catalysis, delivering benzofuran-fused eight-membered heterocycles in high efficiency, regio- and enantioselectivities. Highly diastereoselective derivatizations of the resultant eight-membered cyclic alkenes provide a facile access to diverse fused polycyclic compounds in excellent efficiency.