Carbonylation of various organolithium reagents. A novel approach to heterocycles via intramolecular trapping of aromatic acyllithiums
作者:Keith Smith、Gamal A. El-Hiti、Gareth J. Pritchard、Anna Hamilton
DOI:10.1039/a903467f
日期:——
Doubly lithiated N-pivaloylanilines react smoothly with carbon monoxide at 0 °C to give 3-tert-butyl-3-hydroxy-2,3-dihydroindol-2-ones in good yields. Similarly, carbonylation of doubly lithiated 4-pivaloylamino- and 2-pivaloylaminopyridines at 0 °C affords the corresponding 5-aza- and 7-aza-3-tert-butyl-3-hydroxy-2,3-dihydroindol-2-ones, respectively, in good yields. However, carbonylation of doubly lithiated N-pivaloyl-o-toluidines takes a different course due to direct intramolecular cyclisation of the dilithio reagents to afford 2-tert-butylindoles without uptake of carbon monoxide.
One-pot synthesis of 3-hydroxy-2-oxindoles <i>via</i> acyloin rearrangements of 2-hydroxy-indolin-3-ones generated <i>in situ</i> from 2-alkynyl arylazides
A novel one-pot method to prepare 3-hydroxy-2-oxindoles via acyloin rearrangements of 2-hydroxy-indolin-3-ones generated in situ from 2-alkynyl arylazides has been described. The reaction was accomplished to afford a variety of 3-hydroxy-2-oxindole derivatives in moderate to good yields under mild conditions.
Facile Synthesis of 3-Aryl-3-hydroxy-2-oxindoles from 2-Arylindoles
作者:Hye Ran Moon、Sangku Lee、Hwa Jung Roh、Jae Nyoung Kim
DOI:10.1002/bkcs.10807
日期:2016.7
However, the reaction of 5-nitro derivative 1d did not produce 2d, presumably due to delocalization of the indole anion to the nitro group (vide infra, Scheme 3). The reactions of 2(4-chlorophenyl)indole (1e), 2-(4-methoxyphenyl)indole (1f), 2-(2-naphthyl)indole (1g), and 2-(2-thienyl)indole (1h) afforded the corresponding products 2e–2h in good yields (77–87%). It is interesting to note that the reaction