A three-component approach to isoquinoline derivatives by cycloaddition/Heck reaction sequence
摘要:
Here, we report a three-component coupling reaction approach between an aldehyde, an allyloxyamine, and a maleimide toward isocluinoline derivatives. At first, an oxime O-allylic ether, prepared by dehydrative condensation of the aldehyde and the allyloxyamine, was reacted with the maleimide in the presence of a Pd2+ species. The cycloadduct obtained was then subjected to the Heck cyclization employing a Pd-0 species to give thermodynamically stable diastereomer of isoquinoline derivatives selectively in 25-78% yields. (c) 2007 Elsevier Ltd. All rights reserved.
Alkynyl oxime ether underwent a gold-catalyzed domino reaction involving cyclization and subsequent Claisen-type rearrangement to afford trisubstitutedisoxazoles in a direct, efficient, and regioselective manner. The products were successfully applied to the synthesis of unusual heterocycles as an illustration of the potential utility of the reaction.