Silica sulfuric acid: an efficient reusable heterogeneous solid support for the synthesis of 3H,3′H-spiro[benzofuran-2,1′isobenzofuranj-3,3′-diones under solvent-free condition

被引：28
作者：
Debnath, Kamalesh [1 ]
Pathak, Sudipta [1 ]
Pramanik, Animesh [1 ]
机构：
[1] Univ Calcutta, Dept Chem, Kolkata 700009, India
来源：
TETRAHEDRON LETTERS | 2014年 / 55卷 / 10期
关键词：
Spiro lactones; Green chemistry; Silica sulfuric acid; Solvent-free condition; Reusable solid acid support; C-2 ARYLATED 1,3-INDANEDIONES; PYRROLE-FUSED ISOCOUMARINS; ONE-POT SYNTHESIS; FACILE SYNTHESIS; DERIVATIVES; CATALYST; CONDENSATION; NINHYDRIN; REAGENTS;
D O I：
10.1016/j.tetlet.2014.01.109
中图分类号：
O62 [有机化学];
学科分类号：
070303 ; 081704 ;
摘要：
A highly efficient protocol for the library synthesis of biologically important 3H,3'H-spiro[benzofuran-2,1'isobenzofuran]-3,3'-diones has been developed by employing silica sulfuric acid (SSA) as solid acid support under solvent-free condition. The dual characteristics of SSA, as an activating agent as well as oxidizing agent, have been well exposed in these syntheses. The intrinsic advantages of the methodology are the use of solvent-free reaction condition without using any toxic reagents or metal catalyst, operational simplicity, recyclability of the solid support, good availability of the starting materials, and excellent yields which make the method attractive, economic, and 'benign by design'. (C) 2014 Elsevier Ltd. All rights reserved.
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页码：1743 / 1748
页数：6
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