Cerium(IV) Ammonium Nitrate Is an Excellent, General Catalyst for the Friedländer and Friedländer−Borsche Quinoline Syntheses: Very Efficient Access to the Antitumor Alkaloid Luotonin A
作者:Vellaisamy Sridharan、Pascual Ribelles、M Teresa Ramos、J. Carlos Menéndez
DOI:10.1021/jo900965f
日期:2009.8.7
The use of cerium(IV) ammonium nitrate as a catalyst of the Friedländer reaction allows the synthesis of polysubstituted quinoline derivatives in excellent yields, avoiding the traditional harshly basic or acidic conditions. Unlike most other previously known reagents, CAN allows double condensations and is also an excellent catalyst for the Borsche variation of the Friedländer reaction, which has
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.