of anthranils (III) led to ring enlargement with the formation of 3-acyl-2-methoxy-3H-azepines (IV). The reaction in ether containing water or amines yielded the corresponding 2-oxo- or 2-amino-3H-azepines (V or VII). On the other hand, photolysis of some 7-substituted 3-phenylanthranils (IX and XIII) gave the corresponding 9-acridanone derivatives (X and XIV). A hypothetical scheme (anthranil → nitrene
Cascade Synthesis of 3-Quinolinecarboxylic Ester via Benzylation/ Propargylation−Cyclization
作者:Jinmin Fan、Changfeng Wan、Gaojun Sun、Zhiyong Wang
DOI:10.1021/jo8017654
日期:2008.11.7
Reactions of 2-amino-aryl alcohols with beta-ketoesters catalyzed by a catalytic amout of FeCl3 via tandem benzylation-cyclization produce the corresponding 3-quinolinecarboxylic esters in good to high yields. Extending this methodology to propargylation-cyclization, 2-nitrophenyl proparoyl alcohols with beta-ketoesters catalyzed by FeCl3 and SnCl, also produce the 4-alkyne-3-quitiolinecarboxylic esters. The mechanistic details of this benzylation/proparoylation and cyclization cascade process are also discussed.
[EN] COMPOUNDS, COMPOSITIONS AND METHODS<br/>[FR] COMPOSES, COMPOSITIONS ET PROCEDES