作者:B. V. Subba Reddy、R. Srinivas、J. S. Yadav、T. Ramalingam
DOI:10.1081/scc-100103540
日期:2001.1
Bismuth (III) chloride effectively catalyzes aza-Diels-Alder reaction of N-aryl aldimines with nucleophilic olefins for the first time to afford quinoline derivatives in high yields at ambient temperature. *IICT Communication No. 4499.
[reaction: see text] (R,R)-3-Aza-3-benzyl-1,5-dihydroxy-1,5-diphenylpentane (1) ligated Ti(IV) complex (1-TiCl(2)) is used as a chiral Lewis acid catalyst for promoting asymmetric IED Diels-Alder reaction between electron-rich dienophiles and electron-poor dienes. Here we introduce a facileroute for the synthesis of asymmetric tetrahydroquinoline derivatives using the above-mentioned chiral catalyst
ethyl vinyl ether, 2,3‐dihydropyran, and cyclopentadiene can be promoted by ionicliquids like imidazolium salts and guanidiniumsalts under thermal as well as microwave conditions. The chemical yield as well as the diastereoselectivity of the Povarov reaction strongly depend on the ionicliquid employed. The guanidiniumsalts can be recycled and reused several times without loss of reactivity.