Synthesis of Substituted Quinolines Using the Dianion Addition of <i>N</i>-Boc-anilines and α-Tolylsulfonyl-α,β-unsaturated Ketones
作者:Rolf E. Swenson、Thomas J. Sowin、Henry Q. Zhang
DOI:10.1021/jo0203387
日期:2002.12.1
A short and versatile synthesis of substituted quinolines is provided. Alkylation of sodium tolylsulfinate with bromomethyl- or chloromethyl ketones generates beta-keto sulfones. Knoevenagel condensation of the beta-keto sulfones with an aldehyde provides alpha-tolylsulfonyl-alpha,beta-unsaturated ketones. Michael addition of the dianion of N-Boc-anilines in the presence of CuCN and LiCl with the unsaturated
提供了取代喹啉的短而通用的合成。甲苯磺酸亚磺酸钠与溴代甲基或氯甲基酮的烷基化反应会生成β-酮砜。β-酮砜与醛的Knoevenagel缩合提供了α-甲苯基磺酰基-α,β-不饱和酮。在CuCN和LiCl存在下与不饱和酮进行迈克尔加成反应,生成N-Boc苯胺的1,4-加合物,在Boc基团脱保护并热消除甲苯基砜后,即可得到喹啉。