Lanthanide amides [(Me3Si)2N]3Ln(µ-Cl)Li(THF)3-catalyzed phospho-aldol-brook rearrangement reaction of dialkyl phosphites with isatins
作者:Lu Wang、Zhigang Yao、Fan Xu、Qi Shen
DOI:10.1002/hc.21036
日期:——
The tetracoordinated lanthanideamides [(Me3Si)2N]3Ln(µ-Cl)Li(THF)3 were found to serve as highly active catalysts for the phospho-Aldol-Brookrearrangementreaction of various dialkylphosphites and isatins. The reactions produced dialkyl 2-oxoindolin-3-yl phosphates in good to excellent yields in the presence of 1 mol% [(Me3Si)2N]3La(µ-Cl)Li(THF)3 at room temperature within 5 min. A mechanism for
The present work describes the 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-promoted self-dimerization of 9-chlorofluorenes and 3-chlorooxindoles for the preparation of the corresponding 9,9′-bifluorenylidene and isoindigo derivatives in moderate to good yields of 29–97%. The reactions proceed readily in a short reaction time under mild and metal-free conditions. Scale-up syntheses (5.0 mmol) of selected
A new synthetic approach to oxindoles (1,3-dihydro-2H-indol-2-ones) by reductive dephosphorylation with hydroiodic acid of 3-(diethylphosphoryloxy)- oxindoles, derived from isatins (1H-Indole-2,3-diones)