Arylboronic acid derivatives are versatile intermediates in organic synthesis because of their broad availability, air stability, and ease of handling. Among the routes to arylboronic acid derivatives, the conventional methods that use aryllithium or Grignard reagents have a problem with functional-group compatibility. More recently, functional-group-tolerating approaches such as the transition-metal-catalyzed borylation of aryl halides and the direct C-H borylation'41 of arenes have been introduced, and both are complementarily applicable to the preparation of a wide range of arylboronates.
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