Chiral Squaramide-Catalyzed Asymmetric Mannich Reactions for Synthesis of Fluorinated 3,3′-Bisoxindoles
作者:Bing-Yu Li、Da-Ming Du
DOI:10.1002/adsc.201800513
日期:2018.8.17
squaramide‐catalyzed asymmetric Mannichreaction of 3‐fluorooxindoles to isatin‐derived imines for synthesis of fluorinated 3,3′‐bisoxindoles with two contiguous stereocenters under mild conditions was developed. The corresponding 3,3′‐bisoxindoles were obtained in excellent yields with excellent diastereo‐ and enantioselectivities (up to 99% yield, >99:1 dr and >99% ee). What's more, this reaction can be gram‐scaled
Rh2(OAc)4 catalyzed substrate selective [4+2]/[2+2] cycloaddition of acylketenes: a highly chemo- and regioselective synthesis of spiro(oxindolyl)oxazinones and β-lactams
A rhodium(II) catalyzed [4+2]/[2+2] cycloaddition reaction of N-protected isatin-3-arylimine with acylketene derived from α-diazocarbonyl compounds has been achieved for the first time for the preparation of a novel class of spiro(oxindolyl)oxazinone and spiro(oxindolyl)-β-lactam derivatives.
Isatin Imines in the Reaction with Iminophosphine: X-Ray Structure of Phospholane Derivatives
作者:Mona Hizkial Nasr Arsanious、Soher Said Maigali
DOI:10.1080/00397911.2013.800210
日期:2014.1.17
spirophospholane 4a. On the other hand, the reaction of 3-(4-arylimino)-1-methylindoline-2-ones 2b–2c with trisdimethylaminophosphine 1 in boiling toluene gave phosphoramides 4b and 4c. Furthermore, 1-benzyl-3-(4-arylimino)indolin-2-ones 3a–3c react with aminophosphine 1 in excess as solvent at 110 °C for 6–8 h to give phosphonamides 5a–5c. Possible reaction mechanism are considered and the structural
Simple and Catalyst-Free Synthesis of Oxoindolin-3-yl Phosphonates
作者:Ghazaleh Imani Shakibaei、Saadi Samadi、Ramin Ghahremanzadeh、Ayoob Bazgir
DOI:10.1021/cc900169p
日期:2010.3.8
efficient, simple, and catalyst-free synthesis of dialkyl or diaryl 3-(dicyanomethyl)-2-oxoindolin-3-ylphosphonates by the reaction of dialkyl or diaryl phosphites and oxoindolin-3-ylidenemalononitriles under solvent-free conditions is reported. The reaction of imino isatins with dialkyl or diaryl phosphites results in the formation of dialkyl or diaryl 2-oxo-3-(arylamino)indolin-3-ylphosphonates.
The first direct N-heterocyclic carbene (NHC)-catalyzed preparation of allylic amines bearing a quaternary center (α-tertiary amine) from isatin-derived ketimines in the presence of vinyl selenones and aldehydes is reported. This multicomponent reaction is expected to proceed via unprecedented in situ reduction of iminesthrough a hydride transfer from the aldehydes.