Synthesis of 2,4‐difuryl‐4
<i>H</i>
‐3,1‐benzothiazines via a furan ring migration reaction
作者:Vladimir T. Abaev、Fatima A. Tsiunchik、Alexander V. Butin、Andrey V. Gutnov
DOI:10.1002/jhet.5570450227
日期:2008.3
Abstractmagnified imageA new simple synthetic approach to 2,4‐difuryl‐4H‐3,1‐benzothiazines from 2‐isothiocyanoaryldifuryl‐methanes in the presence of acidic catalyst is described. This rearrangement is a new example of furan ring migration reaction resulting from intramolecular attack with electrophilic carbon.
New synthesis of 2-nitroaryldifurylmethanes
作者:F. A. Tsiunchik、V. T. Abaev、A. V. Butin
DOI:10.1007/s10593-006-0023-4
日期:2005.12
The effect of an N-substituent on the recyclization of (2-aminoaryl)bis(5-tert-butyl-2-furyl)methanes: synthesis of 3-furylindoles and triketoindoles
作者:Alexander V. Butin、Sergey K. Smirnov、Igor V. Trushkov
DOI:10.1016/j.tetlet.2007.11.015
日期:2008.1
The recyclization of (2-aminophenyi)bis(5-tert-butyl-2-furyl)methane derivatives has been studied. It was shown that the acid-catalyzed recyclization of N-tosylamides leads to the formation of 2-(3-oxoalkyl)-3-(2-furyl)indoles. In contrast, under the same reaction conditions, acetamides are transformed into indoles containing three keto groups. The acid-catalyzed removal of the acetyl group from these substrates facilitated protolytic furan ring opening. The same triketones can be directly obtained from (2-aminoaryl)bis(5-tert-butyl-2-furyl)methanes. (C) 2007 Elsevier Ltd. All rights reserved.