Noncovalent Li···H Interaction in the Synthesis of peri-Disubstituted Naphthalene Proton Sponges

Abstract

Noncovalent Li···H interaction was utilised as a tool for the second lithiation of 4-lithio-1,8-bis(dimethylamino)naphthalene with n-BuLi in the presence of TMEDA in hexane. Metallation proceeds with 100% selectivity in the second peri-position and with up to 90% yield. A series of 4,5-disubstituted derivatives of 1,8-bis(dimethylamino)naphthalene has been prepared in good to excellent yield after quenching the reaction mass with different electrophiles.

Key words

agostic interaction - metalation - proton sponge - lithium - naphthalene

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