Synthesis of lycorines by intramolecular aryne cycloadditions
摘要:
Lycorines and related compounds were obtained by a short and convergent method, based on an intramolecular Diels-Alder reaction between an azadiene and an aryne, both generated in situ.
Carboxylic Acid-Enabled Vinylene Transfer Reaction by Co(III) Catalyst: Scope and Applications to the Five-Step Total Synthesis of Protoberberine Alkaloids Containing Free Hydroxyl Group without Protection
A Co(III)-catalyzed vinylene transfer reaction enabled by carboxylic acid is presented. This redox-neutral transformation tolerates various functional groups, including free hydroxyl groups, and features practicality. Five-step routes based on the vinylene transfer reaction and Heck annulation have been devised to the totalsynthesis of 8-oxodehydrodiscretamine and 2-demethyl-oxypalmatine without the
with vinylene carbonate for the synthesis of isoquinolinones and pyridinones has been developed. This protocol employing inexpensive Co(III) as the catalyst tolerated diverse functional groups and substitution patterns, affording the target products with good to excellent yields. The synthetic utility of this transformation was demonstrated by a three-step synthesis of gusanlung D, 8-oxopseudopalmatine
Lycorines and related compounds were obtained by a short and convergent method, based on an intramolecular Diels-Alder reaction between an azadiene and an aryne, both generated in situ.