The radicalreaction of benzenethiol with S-4-pentynyl carbamothioates provides a valuable protocol for the tin-free generation of carbamoylradicals, which arise from intramolecular substitution at sulfur by the initial sulfanylvinyl radicals. This procedure can be usefully employed to achieve N-benzylcarbamoyl radical 5-exo and 4-exo cyclizations leading, respectively, to pyrrolidinones and azetidinones
Organocatalytic Asymmetric Michael/Dieckmann Cyclization Reaction of Alkynones To Construct Spirocyclopentene Oxindoles
作者:Jiawen Lang、Yi Li、Tengfei Kang、Xiaoming Feng、Xiaohua Liu
DOI:10.1021/acs.orglett.9b02519
日期:2019.9.6
catalysis of a chiral guanidine catalyst and NaH. This protocol provides access to a wide range of synthetically useful optically active spirocyclopentenone oxindoles and their derivatives under mild reaction conditions.
Chiral Bifunctional Thiosquaramides as Organocatalysts in the Synthesis of Enantioenriched 3,3-Disubstituted Oxindoles
作者:Patricia Rodríguez-Ferrer、Daniel Naharro、Alicia Maestro、José M. Andrés、Rafael Pedrosa
DOI:10.1002/ejoc.201901327
日期:2019.10.17
Four novel chiral bifunctional thiosquaramides have been prepared from cyclopentyl dithiosquarates and diamines derived from natural l‐valine and l‐tert‐leucine. The novel thiosquaramides have been tested as organocatalyst in the nitro‐Michaeladdition of 3‐substituted oxindoles to different β‐aryl‐substituted nitroalkenes. The reaction occurred easily in high yields and excellent stereoselectivities
Chemoselective Reduction of Isatin-Derived Electron-Deficient Alkenes Using Alkylphosphanes as Reduction Reagents
作者:Shu-Hua Cao、Xiu-Chun Zhang、Yin Wei、Min Shi
DOI:10.1002/ejoc.201100017
日期:2011.5
Under mild reaction conditions, the C=C double bond in isatin-derivedelectron-deficientalkenes has been exclusively reduced in the presence of alkylphosphanes and water to afford the corresponding reduction products in good to excellent yields. A plausible mechanism is proposed on the basis of deuterium-labeling experiments.
An Expedient Synthesis of Oxindole Dimers by Direct Oxidative Dimerization of Oxindoles
作者:Hyun Ju Lee、Sangku Lee、Jin Woo Lim、Jae Nyoung Kim
DOI:10.5012/bkcs.2013.34.8.2446
日期:2013.8.20
Oxindole dimers have been used as intermediates in the synthesis of various cyclotryptamine alkaloids. An efficient directsynthesis of oxindole dimers has been carried out from 3-substituted oxindolesvia an oxidative dimerization using manganese(III) acetate or copper acetate/silver acetate system.