A simple and effective method for the synthesis of 9-sulfenylphenanthrenes was developed. The reaction proceeds through BF₃ ⋅ OEt₂-mediated annulation of 2-alkynyl biaryls with N-arylthio succinimides at room temperature. With this method, a series of 9-sulfenylphenanthrenes was efficiently obtained in good to excellent yields under mild and metal-free conditions.

Abstract

A simple and effective method for the synthesis of 9-sulfenylphenanthrenes was developed via BF₃ ⋅ OEt₂-mediated annulation of 2-alkynyl biaryls with N-arylthio succinimides at room temperature. Through this methodology, a series of 9-sulfenylphenanthrenes could be efficiently and conveniently obtained in good to excellent yields under mild and metal-free conditions.