General synthesis of mono-, di-, and tri-acetylated indoles from indolin-2-ones
摘要:
Having developed the one-pot triacetylation of indolin-3-ones, we have now devised a simple two-step reaction sequences to produce di- and mono-acetylated indoles from indolin-2-ones. The indolin-2-ones were first subjected to acetylation in the presence of acetic anhydride and a catalytic amount of N,N-dimethylaminopyridine to give 2-acetoxy-1,3-diacetylindoles. Subsequently, an enzyme-assisted deacetylation resulted in the chemoselective deprotection of the acetoxy group to produce 1,3-diacetyl-2-hydroxyindoles. However, a chemical deacetylation of 2-acetoxy-1,3-diacetylinoles under mild basic or acidic conditions resulted in the formation of 3-acetyl-2-hydroxyindoles. (C) 2010 Elsevier Ltd. All rights reserved.
General synthesis of mono-, di-, and tri-acetylated indoles from indolin-2-ones
摘要:
Having developed the one-pot triacetylation of indolin-3-ones, we have now devised a simple two-step reaction sequences to produce di- and mono-acetylated indoles from indolin-2-ones. The indolin-2-ones were first subjected to acetylation in the presence of acetic anhydride and a catalytic amount of N,N-dimethylaminopyridine to give 2-acetoxy-1,3-diacetylindoles. Subsequently, an enzyme-assisted deacetylation resulted in the chemoselective deprotection of the acetoxy group to produce 1,3-diacetyl-2-hydroxyindoles. However, a chemical deacetylation of 2-acetoxy-1,3-diacetylinoles under mild basic or acidic conditions resulted in the formation of 3-acetyl-2-hydroxyindoles. (C) 2010 Elsevier Ltd. All rights reserved.
Highly efficient one-pot C-, N- and O-acylation of indolin-2-one analogs
作者:Mukund Jha、Brian Blunt
DOI:10.1016/j.tetlet.2009.08.057
日期:2009.11
A highly efficient one-pot multiple acylation at chemically non-equivalent sites on indolin-2-one and related motifs using 4-(N,N-dimethylamino)pyridine as a catalyst is described. This procedure gives extremely facile entry to highly desired 3-acyl-2-hydroxy-indole synthons among other derivatives. (C) 2009 Elsevier Ltd. All rights reserved.
General synthesis of mono-, di-, and tri-acetylated indoles from indolin-2-ones
作者:Mukund Jha、Ting-Yi Chou、Brian Blunt
DOI:10.1016/j.tet.2010.11.105
日期:2011.2
Having developed the one-pot triacetylation of indolin-3-ones, we have now devised a simple two-step reaction sequences to produce di- and mono-acetylated indoles from indolin-2-ones. The indolin-2-ones were first subjected to acetylation in the presence of acetic anhydride and a catalytic amount of N,N-dimethylaminopyridine to give 2-acetoxy-1,3-diacetylindoles. Subsequently, an enzyme-assisted deacetylation resulted in the chemoselective deprotection of the acetoxy group to produce 1,3-diacetyl-2-hydroxyindoles. However, a chemical deacetylation of 2-acetoxy-1,3-diacetylinoles under mild basic or acidic conditions resulted in the formation of 3-acetyl-2-hydroxyindoles. (C) 2010 Elsevier Ltd. All rights reserved.