A total synthesis of (±)-α-cyclopiazonic acid using a cationic cascade as a key step
作者:Charlotte M. Griffiths-Jones (née Haskins)、David W. Knight
DOI:10.1016/j.tet.2011.08.094
日期:2011.11
The indole alkaloid α-cyclopiazonic acid 1 has been synthesised by a route, which features at its core an acid-catalysed cationic cascade cyclisation terminated by a sulfonamide group.
Electron Transfer Photoredox Catalysis: Development of a Photoactivated Reductive Desulfonylation of an Aza‐Heteroaromatic Ring
作者:Qiang‐Liu、Yu‐Xiu Liu、Hong‐Jian Song、Qing‐Min Wang
DOI:10.1002/adsc.202000578
日期:2020.8.4
protocol for desulfonylation of aza‐heteroaromatic rings via photoinduced electrontransfer and hydrogen atom transfer. This general protocol has a wide substrate range and moderate to good yields. The utility of the method was demonstrated by the chemoselective desulfonylation of a molecule containing both an aliphatic and an aromatic sulfonamide.
Deprotection of N-tosylated indoles and related structures using cesium carbonate
作者:Joginder S. Bajwa、Guang-Pei Chen、Kapa Prasad、Oljan Repič、Thomas J. Blacklock
DOI:10.1016/j.tetlet.2006.06.132
日期:2006.9
A very mild, efficient, and convenient method for deprotection of N-tosylated indoles and related structures by cesium carbonate in THF-MeOH is described. (c) 2006 Elsevier Ltd. All rights reserved.
A Green <i>N</i>-Detosylation of Indoles and Related Heterocycles Using Phase Transfer Catalysis
作者:Yugang Liu、Lichun Shen、Mahavir Prashad、Jessica Tibbatts、Oljan Repič、Thomas J. Blacklock
DOI:10.1021/op700274v
日期:2008.7.1
A practical method for the N-detosylation of indoles and related heterocycles with KOH in THF and water in the presence of a phase transfer catalyst is described. Using a nonalcoholic solvent, this method prevents the formation of toxic alkyl p-toluenesulfonate and consequently eliminates the formation of even traces of N-alkyl byproduct. This green method is particularly useful for indoles bearing electron-withdrawing groups and for azaindoles.
Efficient indole N-detosylation using thioglycolate
作者:Charlotte M. Haskins、David W. Knight
DOI:10.1016/j.tetlet.2003.10.154
日期:2004.1
The dilithium salt of thioglycolic acid in DMF can be used for the very efficient and convenient removal of N-p-toluenesulfonyl (tosyl) groups from a range of indoles at ambient temperature. (C) 2003 Elsevier Ltd. All rights reserved.