Direct one-pot introduction of 2-methylpyridines to Baylis–Hillman adducts via base-mediated 3-aza-Cope rearrangement
作者:Hyun Seung Lee、Sangku Lee、Se Hee Kim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2011.07.101
日期:2011.9
An efficient and regioselective introduction method of 2-methylpyridines to the secondary position of Baylis-Hillman adducts has been developed. A base treatment of 2-methylpyridinium salt of Baylis-Hillman bromide generated N-allylenamine intermediate which underwent a facile 3-aza-Cope rearrangement under mild conditions to produce the product. (C) 2011 Elsevier Ltd. All rights reserved.
Direct C(sp<sup>3</sup>)–H allylation of 2-alkylpyridines with Morita–Baylis–Hillman carbonates via a tandem nucleophilic substitution/aza-Cope rearrangement
base- and catalyst-free C(sp3)–H allylic alkylation of 2-alkylpyridines with Morita–Baylis–Hillman (MBH) carbonates is described. A plausible mechanism of the reaction might involve a tandem SN2’ type nucleophilic substitution followed by an aza-Cope rearrangement. Various alkyl substituents on 2-alkylpyridines were tolerated in the reaction to give the allylation products in 26–91% yields. The developed
描述了 2-烷基吡啶与 Morita-Baylis-Hillman (MBH) 碳酸酯的无碱和无催化剂的 C(sp 3 )-H 烯丙基烷基化反应。该反应的一个合理机制可能涉及串联 S N 2' 型亲核取代,然后是氮杂-科普重排。在反应中可以容忍 2-烷基吡啶上的各种烷基取代基,以 26-91% 的产率得到烯丙基化产物。所开发的方法为 2-烷基吡啶衍生物的烯丙基官能化提供了一种直接且操作简单的策略。