One-Step Synthesis of Complex Nitrogen Heterocycles from Imines and Alkyl-Substituted Maleic Anhydrides
作者:Yuchen Tang、James C. Fettinger、Jared T. Shaw
DOI:10.1021/ol901018k
日期:2009.9.3
Substituted maleic anhydrides react with imines to form polycyclic lactam products. Diastereoselectivity can be controlled by altering the reaction conditions in some cases, and regiochemistry is dictated by the structure of the allylic substituents on the anhydride. Cyclic imines, including dihydro-β-carbolines and dihydroisoquinolines, exhibit the highest level of reactivity in these new annulation
A Short Diastereoselective Synthesis of the Putative Alkaloid Jamtine, Using a Tandem Pummerer/Mannich Cyclization Sequence
作者:Albert Padwa、M. Diana Danca、Kenneth I. Hardcastle、Michael S. McClure
DOI:10.1021/jo026471g
日期:2003.2.1
contamination. Some preliminary studies were directed toward the synthesis of mesembrine using a 3,4-dimethoxy aryl group. In this case, the Z-enamide prefers to undergo electrophilic aromatic substitution to give a substituted azepinone as the preferred product in 87% yield. In contrast, the E-enamide isomer provided the desired hydroindolone. The convergency and stereochemical control associated with the
A totally convergent and very short (three steps) synthesis of (±)-jamtine was described. The key step of this sequence was the condensation of 6,7-dimethoxy-3,4-dihydroisoquinoline and tetrahydrophthalic anhydride under microwave activation which occurred in good yield and high diastereomeric selectivity.