Intramolecular Pd-catalyzed C–H functionalization: construction of fused tetracyclic bis-indole alkaloid analogues
摘要:
An efficient Pd-catalyzed intramolecular indole-C2-arylation protocol for the synthesis of pharmaceutically active bis-indole alkaloid analogues from simple and readily available and 3,3'-Bis(1H-indo1-3-y1) methanes derivatives has been developed. The corresponding products could be obtained in moderate to excellent yields, which permits selective modification on either one of the two indole moieties independently. (C) 2013 Elsevier Ltd. All rights reserved.
I2-promoted direct one-pot synthesis of 2,2-bisindolyl-1-arylethanones from multiform substrates arylethenes, 2-hydroxy-aromatic ketones, and carbinols
摘要:
An I-2-promoted domino protocol was developed to construct 2,2-bisindolyl-1-arylethanones from multiform substrates arylethenes, 2-hydroxy-aromatic ketones, and carbinols via three distinct pathways. Through a logical coupled oxidation/Friedel-Crafts alkylation domino process, a variety of 2,2-bisindolyl-1-arylethanones were synthesized in one-pot. (C) 2013 Elsevier Ltd. All rights reserved.
Gold(III)-catalyzed cycloisomerization of α-bis(indol-3-yl)methyl alkynols selectively affords 1-(indol-3-yl)carbazoles, in a transformation that takes place through a selective 1,2-alkyl vs 1,2-vinyl migration step in the vinyl-gold intermediate generated from the initial 5-endo-spirocyclization. The reaction proceeds well with either tertiary or secondary starting alkynols as well as with a wide
Water and fluorinated alcohol mediated/promoted tandem insertion/aerobic oxidation/bisindolylation under metal-free conditions: Easy access to bis(indolyl)methanes
from indoles and diazocompounds has been developed. The combination of water and fluorinated alcohol plays dual roles as solvent and promoter in this chemical transformation. Molecular oxygen in the air acts as an oxidant. 3,3′-Bis(indolyl)methanes with quaternary carbon were produced under metal-free conditions. No any catalyst and additive were required. N2 and water were released as sole by-products
The first C3-dicarbonylation of indoles was realized through direct oxidative cross-coupling of indoles with methyl ketones in the presence of molecular iodine and pyrrolidine. This reaction constructed a highly efficient indolyl diketones scaffold, which might be regarded as a useful biological and pharmacological tool in the exploration of therapeutic A2BAR modulators. The use of inexpensive molecular
Oxidative Cleavage of C<sub>sp<sup>3</sup></sub>–C<sub>sp<sup>2</sup></sub> and C<sub>sp<sup>3</sup></sub>–H Bonds with KO<sup><i>t</i></sup>Bu: Highly Robust and Practical Synthesis of Diaryl/(het-Ar) Ketones
作者:Srinivasarao Yaragorla、Tabassum Khan、Ahalya Behera
DOI:10.1021/acs.joc.2c02519
日期:2023.2.17
report an efficient and practical approach for synthesizing diaryl(het) ketones from R–CO–CHR–Ar through a simultaneous oxidativecleavage of C–C and C–H bonds using KOtBu. This method enables synthesizing a variety of unsymmetrical and symmetrical (hetero)aryl ketones in excellent yields, which are otherwise difficult to make. Besides, we synthesized natural products using this method.
在此,我们报告了一种通过使用 KO t Bu 同时氧化裂解 C-C 和 C-H 键从 R-CO-CHR-Ar 合成二芳基(杂)酮的有效且实用的方法。这种方法能够以优异的收率合成各种不对称和对称(杂)芳基酮,否则很难制备。此外,我们用这种方法合成了天然产物。