Iodine as a Mild, Efficient, and Cost-Effective Reagent for the Synthesis of <i>cis</i>-1-Oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylic Acids
作者:J. Yadav、B. Reddy、A. Reddy、A. Narsaiah
DOI:10.1055/s-2007-983899
日期:2007.10
Arylimines generated in situ from aromatic aldehydes and anilines undergo smooth coupling with homophthalic anhydride in the presence of 10 mol% of molecular iodine under mild and neutral conditions to afford the corresponding cis-1-oxo-1,2,3,4-tetrahydroisoquinoline-4-carboxylic acids in excellent yields with high cis selectivity. The use of iodine makes this procedure simple, convenient, and cost-effective.
Sulfonic Acid Functionalized Silica: A Mild, Reusable and Efficient Heterogeneous Catalyst for the Highly Diastereoselective Synthesis of cis-Isoquinolonic Acids
作者:Ali Karimi、Rahim Pashazadeh
DOI:10.1055/s-0029-1218595
日期:2010.2
Sulfonic acidfunctionalized silica (SAFS) is found to be a recyclable heterogeneous catalyst for the rapid and efficient synthesis of various cis-isoquinolonic acidsfrom the three-component condensation reaction of homophthalic anhydride, an amine, and an aldehyde. This reaction was highlydiastereoselective and only one diastereomer was obtained in all cases. sulfonic acidfunctionalized silica -