An efficient synthesis of dihydrofuranyl spirooxindoles from isatin-derived propargylic alcohols and 1,3-dicarbonyls
摘要:
Various dihydrofuranyl spirooxindoles have been synthesized via montmorillonite K-10-catalyzed propargylation of 1,3-dicarbonyl compounds with isatin-derived propargylic alcohols and subsequent base-mediated 5-exo-dig cyclization. (C) 2016 Elsevier Ltd. All rights reserved.
Transition-Metal-Free Cyclization of Propargylic Alcohols with Aryne: Synthesis of 3-Benzofuranyl-2-oxindole and 3-Spirooxindole Benzofuran Derivatives
propargylic alcohols with aryne is reported, providing a novel method for the synthesis of 3-benzofuranyl-2-oxindole and 3-spirooxindole benzofuran scaffolds via a propargyl Claisen rearrangement/cycloaddition pathway. The nature of the substituent on acetylene group of propargylic alcohol influences the outcome of the reaction. The protocol offers a transition-metal-free and operationally simple methodology
Synthesis of isatin-conjugated 3H-indole-N-oxides and their serendipitous conversion to spiroindolenines
作者:Hwa Jung Roh、Gieun Kim、Sung Cho、Ji Yeon Ryu、Junseong Lee、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2018.03.003
日期:2018.4
propargylic alcohols and nitrosobenzenes in moderate yields. Isatin-conjugated 3H-indole-N-oxides were converted to novel spiroindolenines under PPh3-mediated deoxygenation reaction condition, serendipitously.
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.