A new and efficient route for the synthesis of (E)-N-methyl-3-styryl-4-quinolones is described. It involves the Heck reaction of N-methyl-3-iodo-4-quinolone, which is obtained by consecutive 3-iodination and NH-methylation of the unsubstituted 4-quinolone, with styrene derivatives. It is demonstrated that such a procedure is only efficient when the 3-iodo-4-quinolone has an N-protecting group. In some cases the branched regioisomers N-methyl-3-(1-phenylethenyl)-4-quinolones were also obtained as byproducts.
描述了一种新颖且高效的合成(E)-N-甲基-3-
苯乙烯基-4-
喹啉酮的路线。该方法涉及将N-甲基-3-
碘-4-
喹啉与
苯乙烯衍
生物进行Heck反应,而N-甲基-3-
碘-4-
喹啉是通过对未取代的4-
喹啉进行连续的3-
碘化和NH-甲基化获得的。研究表明,只有在3-
碘-4-
喹啉具有N-保护基团时,该程序才有效。在某些情况下,支链 regioisomers N-甲基-3-(1-
苯乙烯基)-4-
喹啉酮也作为副产物获得。