Catalyst-Controlled Regiodivergence in Rearrangements of Indole-Based Onium Ylides
作者:Vaishnavi N. Nair、Volga Kojasoy、Croix J. Laconsay、Wang Yeuk Kong、Dean J. Tantillo、Uttam K. Tambar
DOI:10.1021/jacs.1c00283
日期:2021.6.23
metal-coordinated ion-pair in the copper catalyzed [1,2]-rearrangement that recombines in the solvent-cage. The application of our methodology was demonstrated in the first total synthesis of the indole alkaloid (±)-sorazolon B, which enabled the stereochemical reassignment of the natural product. Further functional group transformations of the rearrangement products to generate valuable synthetic intermediates
我们开发了由吲哚底物衍生的鎓叶立德的催化剂控制区域发散重排。由取代的吲哚原位形成的氧鎓叶立德分别在铑和铜催化剂存在下选择性地进行[2,3]-和[1,2]-重排。实验和密度泛函理论 (DFT) 相结合的计算研究表明,不同的机制途径涉及铑催化反应中的无金属叶立德有利于 [2,3]-重排,以及铜催化反应中的金属配位离子对 [1 ,2]-在溶剂笼中重新组合的重排。我们的方法的应用在吲哚生物碱 (±)-sorazolon B 的首次全合成中得到了证明,这使得天然产物的立体化学重新分配成为可能。还展示了重排产物的进一步官能团转化以产生有价值的合成中间体。
Sweet Drugs for Bad Bugs: A Glycomimetic Strategy against the DC-SIGN-Mediated Dissemination of SARS-CoV-2
作者:Jonathan Cramer、Adem Lakkaichi、Butrint Aliu、Roman P. Jakob、Sebastian Klein、Ivan Cattaneo、Xiaohua Jiang、Said Rabbani、Oliver Schwardt、Gert Zimmer、Matias Ciancaglini、Tiago Abreu Mota、Timm Maier、Beat Ernst
DOI:10.1021/jacs.1c06778
日期:2021.10.27
screening hit yielded a glycomimetic ligand with a more than 100-fold improved binding affinity compared to methyl α-d-mannopyranoside. Analysis of binding thermodynamics revealed an enthalpy-driven improvement of binding affinity that was enabled by hydrophobic interactions with a loop region adjacent to the bindingsite and displacement of a conserved water molecule. The identified ligand was employed
Several series of substituted 1,4,5-triazole derivatives bearing various aryls, alkyls and indoles groups were synthetized, as inhibitors of 5′-ectonucleotidase CD73, and evaluated for their potential inhibitory effect on purified recombinant hCD73 enzyme and in cell-based assays. Among them, some compounds were found to be potent enzymatic inhibitors at 10 μM.
Reduction of the indole ring system: synthesis of 4,5,6,7-tetrahydroindoles
作者:Casey C. McComas、David L. Van Vranken
DOI:10.1016/s0040-4039(99)01687-1
日期:1999.11
A general two-step procedure for the reduction of indoles to the corresponding 4,5,6,7-tetrahydroindoles has been developed. A regioselective Birch reduction followed by catalytic hydrogenation is employed to accomplish this transformation. Yields for the sensitive pyrrole products are typically between 40 and 50%. This method provides access to complex chiral pyrroles that cannot be readily prepared