A new ring-opening reaction of 5,6-dihydro-2-pyridones was discovered. Compounds 1 and 7 were converted to the dienoic amides 2 and 8 by reaction with sodium hydride at room temperature. N-Allylation of compounds 2 and 8 followed by IMDA reaction provided the cis-fused hexahydro-1-indolones 5 and 10, respectively. Treatment of compounds 5 and 10 with DBU in refluxing ethyl acetate gave the conjugated
发现了5,6-二氢-2-
吡啶酮的新的开环反应。通过在室温下与氢化
钠反应,将化合物1和7转化为二烯酰胺2和8。化合物2和8的N-烯丙基化,然后进行I
MDA反应,分别提供了顺式融合的六氢-1-
吲哚酮5和10。用
DBU在回流的
乙酸乙酯中处理化合物5和10,得到共轭产物6和11,将其进一步转化为酰胺12 –15。化合物11的苯
硫基被甲基取代,得到产物16。