Brönsted Acid-Catalyzed One-Pot Synthesis of Indoles from <i>o</i>-Aminobenzyl Alcohols and Furans
作者:Alexey Kuznetsov、Anton Makarov、Aleksandr E. Rubtsov、Alexander V. Butin、Vladimir Gevorgyan
DOI:10.1021/jo402132p
日期:2013.12.6
Brönstedacid-catalyzed one-pot synthesis of indoles from o-aminobenzyl alcohols and furans has been developed. This method operates via the in situ formation of aminobenzylfuran, followed by its recyclization into the indole core. The method proved to be efficient for substrates possessing different functional groups, including −OMe, −CO2Cy, and −Br. The resulting indoles can easily be transformed
An efficient three‐component coupling (TCC) reaction toward a variety of 3‐aminoindoline and 3‐aminoindole derivatives has been developed. This cascade transformation proceeds via the copper‐catalyzed coupling reaction between 2‐aminobenzaldehyde, a secondary amine, and an alkyne leading to a propargylamine intermediate which, under the reaction conditions, undergoes cyclization into the indoline core
The Pd-catalyzed migratory cycloisomerization of N-allyl-o-allenyl aniline derivatives is first reported to give indoles having a substituent at the 2-position.
Synthesis of (Z)-1,2-dihydro-1-tosylbenzo[b]azepin-3-ones by two-step, one-pot gold-catalyzed tandem heterocyclization/Petasis–Ferrier rearrangement of 2-(N-(prop-2-ynyl)-N-tosylamino)benzaldehydes
作者:Ella Min Ling Sze、Ming Joo Koh、Yen Min Tjia、Weidong Rao、Philip Wai Hong Chan
DOI:10.1016/j.tet.2013.04.069
日期:2013.7
A two-step, one-pot synthetic method that relies on gold(I)-catalyzed tandem heterocyclization/Petasis-Ferrier rearrangement and Bronsted acid-assisted debenzoxylation of 2-(N-(prop-2-ynyl)-N-tosylamino)benzaldehydes to prepare (2)-1,2-dihydro-1-tosylbenzo[b]azepin-3-ones efficiently is reported. The reactions proceed rapidly under mild and operationally straightforward conditions for a wide variety of aldehyde substrates containing electron-withdrawing, electron-donating, and sterically demanding functional groups and afforded the corresponding benzo-fused azaheterocyclic products in moderate to excellent yields. (C) 2013 Elsevier Ltd. All rights reserved.