Copper-Loaded Layered Bismuth Subcarbonate—Efficient Multifunctional Heterogeneous Catalyst for Concerted C–S/C–N Heterocyclization

An efficient self-supported Cu(II)Bi(III) bimetallic catalyst with a layered structure was designed and developed. By careful characterization of the as-prepared material, host identified to exhibit Sillen-type bismutite framework, copper(II) ions being loaded as guests. The heterogeneous enabled C–N C–S arylations under mild reaction conditions high chemoselectivities, thus furnishing valuable phenothiazines via heterocyclization wide substrate tolerance. As corroborated by detailed catalytic studies, cooperative, bifunctional catalyst, bearing Lewis acid sites along sites, facilitated an intriguing concerted C–N/C–S mechanism. nature reactions verified experimentally. Importantly, successfully recycled reused multiple times, persevering its original structural order well initial activity.