Efficient synthesis of functionalized olefins by Wittig reaction using Amberlite resin as a mild base
作者:Tushar R. Valkute、Eswar K. Aratikatla、Asish K. Bhattacharya
DOI:10.1080/00397911.2016.1276191
日期:2017.3.19
convenient procedure for the synthesis of olefins by the reaction of stabilized, semistabilized, and nonstabilized phosphorous ylides with various aldehydes or ketone using Amberlite resin as a mild base is described. Our developed method offers facile and racemization-free synthesis of α,β-unsaturated amino esters and chiral allylic amine. The developed methodology offers mild reaction conditions, high efficiency
Iodine-Promoted Oxidative Amidation of Terminal Alkenes - Synthesis of α-Ketoamides, Benzothiazoles, and Quinazolines
作者:Ramesh Deshidi、Shekaraiah Devari、Bhahwal Ali Shah
DOI:10.1002/ejoc.201403547
日期:2015.3
A novel metal-free strategy for oxidative amidation of terminal alkenes by using I2/DMSO for the synthesis of α-ketoamides has been developed. Intriguingly, the use of tert-butylhydroperoxide (TBHP) as co-oxidant can facilitate the synthesis of α-ketoamides at room temperature without any solvent, thereby making it a green protocol. The reaction with primary amines can be easily achieved by using SeO2
A facile synthesis of 2,5-disubstituted oxazoles via a copper-catalyzed cascade reaction of alkenes with azides
作者:Jiu-ling Li、Ying-chun Wang、Wei-ze Li、Heng-shan Wang、Dong-liang Mo、Ying-ming Pan
DOI:10.1039/c5cc06487b
日期:——
A novel and efficient approach to 2,5-disubstitutedoxazoles is developed via a 1,3-dipolar cycloaddition/ring cleavage/1,2-H migration/denitrogenation/copper-catalyzed aerobic oxidative dehydrogenative cyclization cascade. The desired products can be obtained from readily available...
Diastereoselective one-pot Wittig olefination–Michael addition and olefin cross metathesis strategy for total synthesis of cytotoxic natural product (+)-varitriol and its higher analogues
作者:Partha Ghosal、Deepty Sharma、Brijesh Kumar、Sanjeev Meena、Sudhir Sinha、Arun K. Shaw
DOI:10.1039/c1ob06039b
日期:——
A stereoselective route for the totalsynthesis of anticancer marine natural product (+)-varitriol (1) is detailed herein. The impressive biological activity and interesting structural features of natural (+)-varitriol fuelled us to undertake the synthesis of some higher analogues (1a–j) of this molecule. The key features of the synthetic strategy include one-pot Wittig olefination followed by a highly
Iron(III)-based metalloradical catalysis for asymmetric cyclopropanation via a stepwise radical mechanism
作者:Wan-Chen Cindy Lee、Duo-Sheng Wang、Yiling Zhu、X. Peter Zhang
DOI:10.1038/s41557-023-01317-8
日期:2023.11
initial application for asymmetric radical transformations. Specifically, we report that five-coordinate iron(III) complexes of porphyrins with an axial ligand, which represent another family of stable 15e-metalloradicals with a d5 configuration, are potent metalloradical catalysts for olefin cyclopropanation with different classes of diazocompounds via a stepwise radical mechanism. This work lays a foundation