Multi-step Synthesis of Organic Selenides under Visible-light Irradiation: A Continuous Flow Approach

HEREDIA, ADRIÁN; SORIA-CASTRO, SILVIA M.; CASTRO-GODOY, WILLBER D.; LEMIR, IGNACIO DANIEL; LÓPEZ-VIDAL, MARTÍN; BISOGNO, FABRICIO R.; ARGÜELLO, JUAN E.; OKSDATH-MANSILLA, GABRIELA

ORGANIC PROCESS RESEARCH & DEVELOPMENT

AMER CHEMICAL SOC

Año: 2020

1083-6160

he potential application of multi-step continuous-flow systems has had a great impact on the syntheses of active pharmaceutical ingredients (APIs), natural products and commodity chemicals. In this report, the highly efficient combination of a chemical reduction and photochemical Csp2-H activation reaction for selenylation of biologically relevant electron-rich arenes was achieved by means of continuous-flow process. Firstly, the reduction of alkyl and aryl selenocyanates by Rongalite® was achieved giving the corresponding diselenides; secondly, photo-activation of the Se-Se bond resulted in the selenylation of electron-rich arenes, both steps from good to excellent yield. In all cases, the reaction time was shortened, and isolated yields were improved when compared to batch reaction conditions. Furthermore, connecting both reactions in a multi-step continuous flow sequence was possible even when reductive and photo-oxidative transformations were coupled.