Synthesis of chiral isoindolinones via asymmetric propargylation/lactamization cascade
作者:Jiao-Long Meng、Tang-Qian Jiao、Ya-Heng Chen、Rui Fu、Shu-Sheng Zhang、Qian Zhao、Chen-Guo Feng、Guo-Qiang Lin
DOI:10.1016/j.tetlet.2018.03.024
日期:2018.4
A Zn-mediated propargylation/lactamization cascade reaction with chiral 2-formylbenzoate derived N-tert-butanesulfinyl imines was realized, which provided a practical and efficient method for the synthesis of chiralisoindolinones. High diastereoselectivities (up to 97:3 dr) and good reaction yields were observed for most examined cases.
Unified Approach to Isoindolinones and THIQs via Lewis Acid Catalyzed Domino Mukaiyama–Mannich Lactamization/Alkylations: Application in the Synthesis of (±)-Homolaudanosine
作者:Sivasankaran Dhanasekaran、Anirban Kayet、Arun Suneja、Vishnumaya Bisai、Vinod K. Singh
DOI:10.1021/acs.orglett.5b01197
日期:2015.6.5
variety of isoindolinones and tetrahydroisoquinolines via a Lewis acid catalyzed domino Mukaiyama–Mannich lactamization/alkylation is achieved. This transformation comprises a sequential formation of three new bonds through a one-pot, three-component procedure to afford product in moderate to high yields. A concise synthesis of (±)-homolaudanosine (2b) has been achieved using this method.
Abstract Difluoro(phenylsulfanyl)methane (PhSCF2H) was found to undergo a reaction with aromatic compounds mediated by SnCl4, through a thionium intermediate characterized by NMR and TD-DFT analyses, leading to the formation of a mixture of S,S′-diphenyl dithioacetal and aromaticaldehyde which, after oxidative hydrolysis, provides the aromaticaldehyde in good to excellent yields. The salient feature
Approach to Isoindolinones, Isoquinolinones, and THIQs via Lewis Acid-Catalyzed Domino Strecker-Lactamization/Alkylations
作者:Sivasankaran Dhanasekaran、Arun Suneja、Vishnumaya Bisai、Vinod K. Singh
DOI:10.1021/acs.orglett.5b03331
日期:2016.2.19
A one-pot, three-component synthesis of widely substituted isoindolinones and isoquinolinones, featuring a Lewisacid-catalyzed efficient Strecker reaction and lactamization sequence, affording products in good to high yields is reported. The method has also been extended to the synthesis of tetrahydroisoquinolines (THIQs) in high yields.
A General Catalytic Route to Isoindolinones and Tetrahydroisoquinolines: Application in the Synthesis of (±)-Crispine A
作者:Sivasankaran Dhanasekaran、Vishnumaya Bisai、Rajshekhar A. Unhale、Arun Suneja、Vinod K. Singh
DOI:10.1021/ol502842f
日期:2014.12.5
An unprecedented highly efficient Lewis acid catalyzed one-pot cascade has been demonstrated as a general catalytic system for the synthesis of diversely substituted isoindolinones and tetrahydroisoquinolines. The cascade effects one C–C and two C–N bond-forming events in one pot. Several interesting transformations of the products into valuable synthetic intermediates are featured with the successful