Complex-Induced Proximity Effect in the Regioselective Lithiation of Pyridine Derivatives
作者:Jaspreet S. Dhau、Amritpal Singh、Yoganjaneyulu Kasetti、P. V. Bharatam
DOI:10.1002/ejoc.201101592
日期:2012.3
The regioselective ring lithiation of BF3-complexed 3-picoline (1a), 3,4-lutidine (1b), and 3,5-lutidine (1c) was studied. The dilithiation of 1a, 1b, and 1c was also investigated to experimentally explore the relative preference of the sites on the substituted pyridine ring for lithiation. The role of the complex-induced proximity effect (CIPE) for inducing lithiation in these moieties was investigated
研究了 BF3 络合的 3-甲基吡啶 (1a)、3,4-二甲基吡啶 (1b) 和 3,5-二甲基吡啶 (1c) 的区域选择性环锂化。还研究了 1a、1b 和 1c 的二锂化,以通过实验探索取代吡啶环上的位点对锂化的相对偏好。使用实验和计算研究研究了复合物诱导邻近效应 (CIPE) 在这些部分中诱导锂化的作用。