1,3‐Dipolar cycloaddition of stabilized azomethine ylides to alkenyl quinolines: An efficient route to polyfunctionalized 3‐pyrrolidinylquinoline derivatives
Some new polysubstituted 3-pyrrolidinylquinolinyl derivatives were prepared by 1,3 dipolar cycloadditions of an azomethineylide, generated in situ from benzylideneimine of methylglycinate and triethylamine in the presence of LiBr, to quinolyl α,β-unsaturated esters
An efficient synthesis of benzo[<i>b</i>][1,8]naphthyridine-3-carboxylic methyl esters
作者:V. Nithyadevi、S. P. Rajendran
DOI:10.1002/jhet.5570430334
日期:2006.5
Methyl-3-(2-chloroquinolin-3-yl)acrylates 5a-i on reaction with methyl amine in acetonitrile yielded methyl-3-[2-(methylamino)quinolin-3-yl]acrylates 6a-i. When, these were followed by the reaction with the Vilsmeier reagent, they afforded methyl benzo[b][1,8]naphthyridin-3-carboxylate 7a-i in good yields.
甲基-3-(2-氯喹啉-3-基)丙烯酸酯5a-i与甲胺在乙腈中反应,得到甲基-3- [2-(甲基氨基)喹啉-3-基]丙烯酸酯6a-i。当这些之后,与Vilsmeier试剂反应时,它们以良好的产率提供了苯并[ b ] [1,8]萘啶-3-羧酸甲酯7a-i。
Efficient Synthesis of Quinolo-oxepanes Through [3+2] Cycloaddition Reaction of a,b-Unsaturated Ester with Unstabilized Azomethine Ylides
New functionalized quinolo-oxepane were achieved by intramolecular 1,3-dipolar cycloaddition reaction of a,b-unsaturated ester with unstabilized azomethine ylides derived from various a-amino acids with high stereo selectivity and good yields. These derivatives were synthesized via Wittig reaction under mild, neutral conditions in a short duration and consistently good yields. The structures of final compounds were characterized by spectral analysis.