Transition-Metal-Free Synthesis of Borylated Thiophenes via Formal Thioboration
作者:Hassen Bel Abed、Suzanne A. Blum
DOI:10.1021/acs.orglett.8b02727
日期:2018.11.2
exclusively 3-borylated thiophene derivatives is reported. The commercially available B-chlorocatecholborane reagent (ClBcat) acts as a carbophilic Lewis acid to activate the alkyne in readily synthesized (Z)-organylthioenyne substrates. This boron-induced activation initiates the formal thioboration and subsequent sulfur dealkylation, leading to the formation of 3-borylated thiophenes in good yields. The