Palladium(II)-Catalyzed Intramolecular Diamination of Unfunctionalized Alkenes
作者:Jan Streuff、Claas H. Hövelmann、Martin Nieger、Kilian Muñiz
DOI:10.1021/ja055190y
日期:2005.10.1
Intramolecular diamination reactions are described which yield cyclic ureas as direct products of an oxidative alkene transformation in the presence of palladium acetate and iodosobenzenediacetate as terminal oxidant. The reaction is truly catalytic in metal catalyst and represents the proof of principle for this elusive type of alkene oxidation.
Hydroalkylation of Unactivated Olefins via Visible-Light-Driven Dual Hydrogen Atom Transfer Catalysis
作者:Guangyue Lei、Meichen Xu、Rui Chang、Ignacio Funes-Ardoiz、Juntao Ye
DOI:10.1021/jacs.1c05852
日期:2021.7.28
hydroalkylation of olefins enabled by hydrogen atom transfer (HAT) catalysis represents a straightforward means to access C(sp3)-rich molecules from abundant feedstock chemicals without the need for prefunctionalization. While Giese-type hydroalkylation of activated olefins initiated by HAT of hydridic carbon–hydrogen bonds is well-precedented, hydroalkylation of unactivated olefins in a similar fashion
通过氢原子转移 (HAT) 催化实现的烯烃自由基加氢烷基化代表了一种直接获得 C( sp 3)-丰富的分子来自丰富的原料化学品,无需预官能化。虽然由氢化碳-氢键的 HAT 引发的活性烯烃的 Giese 型加氢烷基化是有先例的,但未活化烯烃以类似方式的加氢烷基化仍然难以捉摸,主要是由于缺乏克服固有极性不匹配的通用方法。设想。在这里,我们报告了使用可见光驱动的双 HAT 催化来实现这一目标,其中催化量的胺硼烷和原位生成的硫醇分别用作氢原子提取物和供体。该反应是完全原子经济的,具有广泛的范围。
Multifunctionalization of alkenes via aerobic oxynitration and sp3 C–H oxidation
bond of aliphatic alkenes using tert-butyl nitrite and molecular oxygen to give gamma-lactols has been developed. The present reaction proceeds through a sequence of radical processes involving oxynitration followed by aerobic oxidation of an sp(3) C-H bond. This multifunctionalization reaction requires neither metallic reagents nor photolysis and proceeds under mild conditions.
Silver-promoted cascade radical cyclization of γ,δ-unsaturated oxime esters with P(O)H compounds: synthesis of phosphorylated pyrrolines
作者:Chen Chen、Yinwei Bao、Jinghui Zhao、Bolin Zhu
DOI:10.1039/c9cc08124k
日期:——
A cascade radicalcyclization was realized for the first silver-promoted imino-phosphorylation of γ,δ-unsaturated oxime esters, which provided a step-economical and redox-neutral route to access a variety of phosphorylated pyrrolines in good to excellent yields. Moreover, a new bulky trivalent phosphine ligand with a pyrroline motif was obtained through a deoxidation process.
A catalyticapproach to the titanocene-mediated radical cyclization of epoxy nitriles and epoxy carbonyl compounds to hydroxy ketones and diols is described. The reaction is sensitive to the substitution pattern of the catalyst and especially useful for the preparation of cyclobutanones. It can also be used for nitrile grouptransfer.