Multicomponent Domino Approaches for the Synthesis of Spirooxazolidine‐2‐thiones and Spirooxothiolane‐2‐imines
作者:Divakar Reddy Indukuri、Gal Reddy Potuganti、Arsha Maria Cherian、Jagadeesh Babu Nanubolu、Yarasi Soujanya、Manjula Alla
DOI:10.1002/ejoc.202100739
日期:2021.10.14
and spirooxothiolane-2-imines starting from isatin, phenyl acetylene and isothiocyanates has been accomplished. The reactivity of ambident nucleophilic sites: nitrogen and sulfur in an isothiocyanate is explored and an attempt has been made to fine tune the reactionparameters for product selectivity. The domino reaction proceeds by the addition and 5-exo dig cyclization via hydroamination/hydrothiolation
Synthesis of 3-ethynyl-3-hydroxy-2-oxindoles and 3-hydroxy-3-(indol-3-yl) indolin-2-ones using CuWO4 nanoparticles as recyclable heterogeneous catalyst in aqueous medium
acetylenes (spC-H activation) and selective synthesis of 3-hydroxy-3-(indol-3-yl) indolin-2-ones and 3,3′-bis(indolyl)indolin-2-ones (via Friedel-Crafts alkylation reaction) is reported in presence of CuWO4 (10 mol%) nanoparticles in aqueous medium. The catalyst was regenerated and reused up to 6 cycles without losing catalytic activity. This is the first report for the spC-H activation using CuWO4
Cycloisomerization of Oxindole-Derived 1,5-Enynes: A Calcium(II)-Catalyzed One-Pot, Solvent-free Synthesis of Phenanthridinones, 3-(Cyclopentenylidene)indolin-2-ones and 3-Spirocyclic Indolin-2-ones
Calcium‐catalyzed regioselective synthesis of oxindole‐derived 1,5‐enynes, followed by cycloisomerization, from readily accessible 3‐hydroxy‐3‐(alkynyl)indolin‐2‐ones and styrenes in one‐pot, under solvent‐free conditions is described. This method offers the synthesis of diverse molecules: phenanthridinones, 3‐(cyclopentenylidene)indolin‐2‐ones, and 3‐spirocyclic indolin‐2‐ones are obtained through
One-pot synthesis of 3-naphtho[2,1-b]furanyl-2-oxindoles from 3-(arylethynyl)-3-hydroxyindolin-2-ones and 2-naphthols
作者:Hwa Jung Roh、Jin Woo Lim、Ji Yeon Ryu、Junseong Lee、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2016.08.017
日期:2016.9
3-Naphthofuranyl-2-oxindoles were synthesized by the reaction of 3-(arylethynyl)-3-hydroxyindolin-2-ones and 2-naphthols via Friedel–Crafts reaction and a following Michael type 5-exo-dig cyclization. In addition, dihydrofuranyl-spirooxindoles were synthesized from 3-(ortho-hydroxyaryl)-2-oxindoles by base-catalyzed cyclization reaction.
Synthesis of Spirooxindoles Bearing 1,
<scp>3‐Oxathiolane</scp>
‐2‐thione Moiety From
<scp>Isatin‐Derived</scp>
Propargylic Alcohols
作者:Jae Nyoung Kim、Sangku Lee
DOI:10.1002/bkcs.12206
日期:2021.3
Spirooxindoles bearing 1,3‐oxathiolane‐2‐thione moiety were synthesized from isatin‐derived propargylic alcohols and carbon disulfide in the presence of 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU). The spirooxindoles were formed stereoselectively via attack of the alkoxide of propargylic alcohol to carbon disulfide to form xanthate anion and a following 5‐exo‐dig cyclization process.