N-Cyclopropylation of Indoles and Cyclic Amides with Copper(II) Reagent
摘要:
Copper-mediated coupling reactions of cyclopropylboronic acid with indoles and cyclic amides are described. The process utilizes catalytic or stoichiometric amounts of copper(II) acetate, DMAP, and NaHMDS at 95 degrees C under an atmosphere containing oxygen. A variety of functional groups remain intact throughout the reaction.
The N-cyclopropylation of aromatic and aliphatic secondaryacyclicamides, known to be poor nucleophiles, has been accomplished using a simple and cheap copper system. The corresponding tertiary acyclicamides, which constitute a wide family of biologically active compounds, have been obtained in good to excellent yields.