Condensation reactions of activated picolines with anthranilate esters and<i>o</i>-nitrobenzaldehyde: Improved syntheses of the antiarrhythmic drug encainide
作者:John L. Dillon、Richard H. Spector、Gary D. Madding、Mary E. Wire
DOI:10.1002/jhet.5570300321
日期:1993.5
amide of methyl anthranilate, 3, followed by a series of catalytic hydrogenations and methylation. The second route relies on a particularly facile condensation reaction between N-methylpicolinium methyl sulfate and o-nitrobenzaldehyde to produce the alcohol 17c in high yield which is converted to the olefin 18c by a novel dehydration procedure and then to the final molecule, by catalytic hydrogenation
提出了两种新的和改进的抗心律不齐药物Encainide 1的合成方法。第一种方法基于2-吡啶甲基锂与邻氨基苯甲酸甲酯3的对-异戊酰胺的缩合,然后进行一系列催化氢化和甲基化。第二种途径依赖于N-甲基吡啶甲基硫酸甲酯和邻硝基苯甲醛之间特别容易的缩合反应,以高收率生产醇17c,该醇通过新颖的脱水方法转化为烯烃18c,然后通过催化加氢转化为最终分子在铂上,然后进行酰化反应。