�ber halogen- und stickstoffhaltige Derivate aliphatischer Carbons�uren, 5. Mitt.: �ber die Gewinnung von ?-Oximinocarbons�ureestern und ihre �berf�hrung in ?-Ketos�uren
Synthesis of <i>m</i>-Alkylphenols via a Ruthenium-Catalyzed C–H Bond Functionalization of Phenol Derivatives
作者:Gang Li、Panpan Gao、Xulu Lv、Chen Qu、Qingkai Yan、Ya Wang、Suling Yang、Junjie Wang
DOI:10.1021/acs.orglett.7b00885
日期:2017.5.19
The first example of the synthesis of m-alkylphenols via a ruthenium-catalyzed CAr–H bond functionalization of phenolderivatives with sec/tert-alkyl bromides is reported. Mechanistic studies indicated that the m-CAr–H bond alkylation may involve a radical process and that a six-membered ruthenacycle complex was the active catalyst. Moreover, this approach can provide an expedited strategy for the
合成的第一个例子米烷基酚经由钌催化Ç氩苯酚衍生物与-H键官能/叔秒报道烷基溴化物。机理研究表明,m -C Ar -H键烷基化可能涉及自由基过程,六元钌环络合物是活性催化剂。而且,这种方法可以为许多值得注意的药物和其他功能分子的原子/步经济合成提供快速的策略。
One-pot oxidative bromination – Esterification of aldehydes to 2-bromoesters using cerium (IV) ammonium nitrate and lithium bromide
作者:Gennady I. Nikishin、Nadezhda I. Kapustina、Lyubov' L. Sokova、Oleg V. Bityukov、Alexander O. Terent'ev
DOI:10.1016/j.tetlet.2016.12.036
日期:2017.1
two-step, one-pot reaction of aldehydes with the CAN/LiBr oxidation system under solvent-free conditions followed by the addition of methanol affords methyl α-bromocarboxylates. The oxidation of aldehydes with methanol using this system gives only methyl esters. A facile method, which does not require special equipment, was developed for the synthesis of 2-bromoesters from aliphaticaldehydes with carbon