Boron-Catalyzed Arylthiooxygenation of N-Allylamides: Synthesis of (Arylsulfanyl)oxazolines

Abstract

Oxazoles and aryl sulfides are chemical entities that are found in many natural products and biologically and pharmaceutically active molecules. It is therefore highly desirable to develop an efficient and practical approach to the synthesis of arylsulfanyl-substituted oxazolines. We developed a simple and efficient method for boron-catalyzed sequential arylsulfanylation and oxygenation of N-allylamides. The protocol uses readily available 1-(arylsulfanyl)pyrrolidine-2,5-diones as the arylsulfanylation reagents and inexpensive boron trifluoride etherate as the catalyst; no ligands or additives are required, and it is not necessary to purge the reaction vessel of air. The method therefore provides an efficient and practical strategy for the synthesis of arylsulfanyl-substituted heterocycles.

Key words

oxazoles - sulfurizations - sulfides - oxygenations

• References


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