base-promoted [2+1] annulationreaction has been developed for the synthesis of the structural diversity C2-spirocyclopropyl-indolin-3-ones. This [2+1] annulation process using simple and easily prepared nucleophilic indolin-3-ones (as C1 synthons) and bromosulfonium salts (as C2 synthons) as substrates, and realized the synthesis of C2-spirocyclopropyl-indolin-3-ones with up to 99 % yield and >20 : 1 dr.
已经开发了一种简单有效的碱促进 [2+1] 环化反应,用于合成结构多样性 C2-spirocyclopropyl-indolin-3-ones。这种[2+1]环化过程以简单易制备的亲核三氢吲哚-3-酮(C1合成子)和溴硫盐(C2合成子)为底物,实现了C2-螺环丙基-3-二氢吲哚-酮的合成高达 99% 的产率和 >20 : 1 dr.
5,5′-Substituted Indirubin-3′-oxime Derivatives as Potent Cyclin-Dependent Kinase Inhibitors with Anticancer Activity
To enhance the ability of indirubin derivatives to inhibit CDK2/cyclin E, a target of anticancer agents, we designed and synthesized a new series of indirubin-3'-oxime derivatives with combined substitutions at the 5 and 5' positions. A molecular docking study predicted the binding of derivatives with OH or halogen substitutions at the 5' position to the ATP binding site of CDK2, revealing the critical interactions that may explain the improved CDK2 inhibitory activity of these derivatives. Among the synthesized derivatives, the 5-nitro-5'-hydroxy analogue 3a and the 5-nitro-5'-fluoro analogue Sa displayed potent inhibitory activity against CDK2, with IC(50) values of 1.9 and 1.7 nM, respectively. These derivatives also showed antiproliferative activity against several human cancer cell lines, with IC(50) values of 0.2-3.3 mu M. A representative analogue, 3a, showed greater than 500-fold selectivity for CDK relative to selected kinase panel and potent in vivo anticancer activity.
KI-Catalyzed C(sp<sup>3</sup>)–H Amination and Acyloxylation of Indolin-3-ones Using Air as the Oxidant