The Directed Lithiation Route to 2-Amino-3-alkylquinones: Highly Regioselective Introduction of Electrophiles at the C-7 Position of 2(1<i>H</i>)-Quinolinones
作者:J. Menéndez、Juan Sánchez、Pilar Cledera、Subbu Perumal、Carmen Avendaño
DOI:10.1055/s-2007-990957
日期:——
An ortho-directed lithiation strategy starting from 2-ami- no-1,4-dimethoxybenzene derivatives allowed the efficient prepa- ration of 2-amino-3-alkylbenzoquinone derivatives. This method was also successful in the case of 6-pivaloylamino-4-methyl-5,8- dimethoxycarbostyril derivatives, in spite of the fact that two other modes of lithiation are possible, and allowed the preparation of de- rivatives
从 2-氨基-1,4-二甲氧基苯衍生物开始的邻位定向锂化策略允许有效制备 2-氨基-3-烷基苯醌衍生物。这种方法在 6-新戊酰氨基-4-甲基-5,8-二甲氧基喹啉衍生物的情况下也是成功的,尽管事实上有两种其他的锂化模式是可能的,并且允许制备含有烷基链或高度受阻的 C-7 位置的官能团。从 4-甲基-5,8-二甲氧基-2-新戊酰氧基喹啉开始的反应被区域选择性地导向 C-4 甲基。