Copper-Catalyzed C(sp<sup>3</sup>)-C(sp<sup>2</sup>) Cross-Coupling: Synthesis of 4-Aryl-2-alkylamino-3-nitro-4<i>H</i>-chromenes
作者:H. Surya Prakash Rao、A. Veera Bhadra Rao
DOI:10.1002/ejoc.201402003
日期:2014.6
Inexpensive copper(II) acetate effectively catalyzes cross-coupling of electron-deficient as well as electron-rich arylboronic acids with 4-methylsulfanyl-2-alkylamino-3-nitro-4H-chromenes under near neutral conditions at room temp. to furnish a range of 4-aryl-4H-chromenes. This new strategy enabled substitution of the C(4)SMe group present on a sp3 hybridized carbon of the 4H-chromenes with aryl/heteroaryl