The preparation of (Z)-2-lithio-ortho-styryllithium via an ortho-directed lithiation

摘要

Lithiation of (Z)-2-lithiostyrene with t-butyllithium/TMEDA pentane led directly to (Z)-2-lithio-ortho-styryllithium. Subsequent treatment of this dilithio compound with difunctional electrophiles allowed the preparation of a variety of benzo[b]heteroles.