t‐BuOH Solvent for CuSeO₃CatalyzedCsp²‐SeCross‐coupling of Diaryldiselenide with Arylhalides and Boronic acids

Abstract

Formation of carbon-selenium bond by Csp 2 -Se cross-coupling using diaryldiselenides and arylhalides are very few in literature. Herein we report CuSeO 3 .2H 2 O as an efficient catalyst for direct Csp 2 -Se cross-coupling of diaryldiselenides with aryl iodides, bromides and aryl boronic acids. The reaction is performed at low temperature (70 °C) in tert-butanol solvent in absence of ligand. Arylboronic acids are more reactive than aryliodides and bromides.

A CuMoO4 nanocatalyst for Csp2–O cross-couplings; easy access to nitrofen derivatives

“…The Cu( ii ) center is supposed to play a vital role in oxidative addition and reductive elimination with the help of molybdenum. 15,18,19 The oxygen bridge might open in the presence of aryl halide and DMF through precursor complex b Cu( iii ), which on subsequent reaction with phenols and KOH forms complex c . Subsequent reductive elimination of aryl ether regenerates catalyst a for the subsequent cycle.…”

“…12 We recently reported a CuMoO 4 catalyst for N -arylations, S -arylations, and Se -arylations, 13,14 a BaMoO 4 catalyst for S -arylations, and CuSeO 3 for Se -arylations. 15…”