An efficient, transition-metal-free process for the synthesis of substituted dihydrofurans via a Michael/cyclization tandem reaction
摘要:
An efficient green route for the synthesis of substituted dihydrofurans was developed through a simple base-catalyzed, tandem reaction of nitrostyrene with 1,3-dicarbonyl compounds. The desired products were prepared with a large substrate scope and in excellent yields (up to 95%). (C) 2010 Elsevier Ltd. All rights reserved.
A tandem Michael addition–cyclization of nitroalkenes with 1,3-dicarbonyl compounds was developed using phase transfer catalyst (PTC), allowing for the synthesis of polysubstituted-[4,5]-dihydrofuran in high yields. A wide range of substrates were demonstrated by this one-step process. Meanwhile, nitrogroup was substituted to form corresponding nitrite ion detected in the aqueous phase providing a