作者:Takafumi Ide、Kaibo Feng、Charlie F. Dixon、Dawei Teng、Joseph R. Clark、Wei Han、Chloe I. Wendell、Vanessa Koch、M. Christina White
DOI:10.1021/jacs.1c06335
日期:2021.9.22
preparative intermolecular allylic C–H amination of 32 cyclic and linear compounds, including ones housing basic amines and competing sites for allylic, ethereal, and benzylic amination. Mechanistic studies support that the high selectivity of [MnIII(ClPc)] may be attributed to its electrophilic, bulky nature and stepwise amination mechanism. Late-stage amination is demonstrated on five distinct classes
烯丙基胺化能够实现天然产物的后期功能化,其中烯丙基 C-H 键丰富,氮的引入可能会改变生物特征。尽管取得了进展,但由于反应性和选择性问题,分子间烯丙胺化仍然是一个具有挑战性的问题,这些问题通常需要过量的底物,提供产物混合物,并使重要类别的烯烃(例如,官能化环状)不可行的底物。在这里,我们报道了一种可持续的锰全氯酞菁催化剂,[Mn III (ClPc)],实现了 32 种环状和线性化合物的选择性、制备性分子间烯丙基 C-H 胺化,包括含有碱性胺和烯丙基、醚和苄基竞争位点的化合物胺化。机理研究表明[Mn III (ClPc)]的高选择性可能归因于其亲电性、体积大的性质和逐步胺化机制。后期胺化作用在五种不同类别的天然产物中得到证实,通常具有 >20:1 的位点选择性、区域选择性和非对映选择性。
FIROUZABADI, H.;MOTTIGHINEJAD, E.;SEDDIGHI, M., SYNTHESIS,(1989) N, C. 378-380
作者:FIROUZABADI, H.、MOTTIGHINEJAD, E.、SEDDIGHI, M.
DOI:——
日期:——
Barium Permanganate, Ba(MnO<sub>4</sub>)<sub>2</sub>;<sup>1</sup>An Efficient and Mild Oxidizing Agent for Use Under Non-aqueous and Aprotic Conditions
作者:H. Firouzabadi、E. Mottghinejad、M. Seddighi
DOI:10.1055/s-1989-27256
日期:——
Barium permanganate is used for the efficient oxidation of different types of alcohols and acyloins to the corresponding carbonyl compounds in boiling acetonitrile. The mildness of this reagent is shown by the oxidative S,S-coupling of several thiols to disulfides.
Organoselenium-catalyzed enantioselective syn-dichlorination of unbiased alkenes
作者:Bradley B. Gilbert、Stanley T.-C. Eey、Pavel Ryabchuk、Olivia Garry、Scott E. Denmark
DOI:10.1016/j.tet.2019.05.054
日期:2019.8
the enantioselective suprafacial dichlorination of alkenes catalyzed by electrophilic organoselenium reagents has been developed to address these limitations. The evaluation of twenty-three diselenides as precatalysts for enantioselective dichlorination is described, with a maximum e.r. of 76:24 Additionally, mechanistic studies suggest an unexpected DynamicKineticAsymmetricTransformation (DyKAT)
烯烃的对映选择性二氯化是有机合成中持续存在的挑战,因为亲电子氯和亲核氯化物选择性和独立地反面递送至烯烃的局限性。开发用于分离烯烃的对映选择性二氯化的通用方法将允许获得多种多卤代天然产物。因此,已经开发了由亲电子有机硒试剂催化的烯烃的对映选择性表面二氯化来解决这些限制。描述了对 23 种二硒化物作为对映选择性二氯化反应预催化剂的评估,最大 er 为 76:24 此外,机理研究表明意外的动态动力学不对称转化 (DyKAT) 过程可能是有效的。