A systematic study of two complementary protocols allowing the general, mild and efficient deprotection of N-pivaloylindoles
作者:Míriam Ruiz、J. Domingo Sánchez、Pilar López-Alvarado、J. Carlos Menéndez
DOI:10.1016/j.tet.2011.10.098
日期:2012.1
of indoles and related fused heterocyclic systems are described, involving either hydride transfer from LDA or hydrolysis by the DBU–water system. Both methods were shown to tolerate a wide variety of substituents and functional groups, but the hydrolytic one proved to be particularly general, being compatible with 2-alkyl substituents, aldehydes, ketones, carboxylic acids, halogens, ethers, amides
描述了两种温和而通用的方案,用于吲哚和相关稠合杂环系统的高产率脱保护,涉及LDA-水系统中LDA的氢化物转移或水解。两种方法都被证明可以耐受各种各样的取代基和官能团,但是水解方法被证明是特别通用的,与2-烷基取代基,醛,酮,羧酸,卤素,醚,酰胺和酯兼容。在这两种情况下,收率通常都很高,但是对于还原法,收率通常略高。综上所述,这两种方案提供了对吡咯并吲哚脱保护问题的一般解决方案。