Side-Chain Retention During Lithiation of 4-Picoline and 3,4-Lutidine: Easy Access to Molecular Diversity in Pyridine Series
作者:Thomas Kaminski、Philippe Gros、Yves Fort
DOI:10.1002/ejoc.200300243
日期:2003.10
The first direct ring-selective lithiation of 4-picoline and 3,4-lutidine has been achieved through the use of BuLi/LiDMAE aggregates to prevent the usual side-chain metallation. Several functionalities have been introduced at the C-2, C-6 and C-5 positions by ring-selective sequential lithiation, opening a simple and fast route to polysubstituted pyridine building blocks. (© Wiley-VCH Verlag GmbH
4-甲基吡啶和3,4-二甲基吡啶的首次直接环选择性锂化是通过使用BuLi/LiDMAE聚集体来防止通常的侧链金属化实现的。通过环选择性顺序锂化在 C-2、C-6 和 C-5 位置引入了几种功能,为多取代吡啶构建块开辟了一条简单快速的途径。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)