Efficient and simple methods for the introduction of the sulfonyl, acyl and alkyl protecting groups on the nitrogen of indole and its derivatives
作者:Olívia Ottoni、Rosimeire Cruz、Robledo Alves
DOI:10.1016/s0040-4020(98)00865-5
日期:1998.11
The benzenesulfonylation, acetylation, methylation and benzylation at the 1 position of indole and its derivatives with bases such as NaOH, KOH and NEt3 are presented. By using weaker bases than the traditional ones (BuLi, NaNH2, etc.), the process is simpler, more general and leads to the products in 80–100% yields. The chemoselectivity in compounds bearing more than one nitrogen is also demonstrated
提出了吲哚及其衍生物与碱如NaOH,KOH和NEt 3的1位上的苯磺酰化,乙酰化,甲基化和苄基化。通过使用比传统碱(BuLi,NaNH 2等)弱的碱,该方法更简单,更通用,并导致产品的收率达到80-100%。还证明了在具有多个氮原子的化合物中的化学选择性。