Manganese-Catalyzed Anti-Markovnikov Hydroamination of Allyl Alcohols via Hydrogen-Borrowing Catalysis
作者:Kuhali Das、Koushik Sarkar、Biplab Maji
DOI:10.1021/acscatal.1c01199
日期:2021.6.18
In this article, a selective formal anti-Markovnikov hydroamination of allyl alcohols is presented. It enables the versatile synthesis of valuable γ-amino alcohol buildingblocks. A phosphine-free Earth’s abundant manganese(I) complex catalyzed the reaction under hydrogen-borrowing conditions. A vast range of aliphatic, aromatic amines, drug molecules, and naturalproduct derivatives underwent successful
The borrowing-hydrogen (or hydrogen autotransfer) process, where the catalyst dehydrogenates a substrate and formally transfers the H atom to an unsaturated intermediate, is an atom-efficient and environmentally benign transformation. Described here is an example of an asymmetric borrowing-hydrogen cascade for the formal anti-Markovnikov hydroamination of allyl alcohols to synthesize optically enriched
Rhodium-Catalysed Coupling of Allylic, Homoallylic, and Bishomoallylic Alcohols with Aldehydes and<i>N</i>-Tosylimines: Insights into the Mechanism
作者:Nanna Ahlsten、Belén Martín-Matute
DOI:10.1002/adsc.200900448
日期:2009.11
alkenols followed by reaction with aldehydes or N-tosylimines catalysed by rhodiumcomplexes has been studied. The catalytically active rhodiumcomplex is formed in situ from commercially available (cyclooctadiene)rhodium(I) chloride dimer [Rh(COD)Cl]2. The tandem process affords aldol and Mannich-type products in excellent yields. The key to the success of the coupling reaction is the activation of
已经研究了烯醇的异构化,然后与铑络合物催化的醛或N-甲苯胺反应。催化活性的铑配合物是由可商购的(环辛二烯)氯化铑(I)二聚体[Rh(COD)Cl] 2原位形成的。串联过程以优异的产率提供了羟醛和曼尼希型产品。于偶联反应的成功的关键是,催化剂的活化通过与postassium叔丁醇(叔丁醇钾),这促进了催化循环通过醇盐,而不是铑的氢化物。该机制使不需要的副产物的形成最小化。该机制已被1研究1 H NMR光谱和氘标记实验。
Pentamethylcyclopentadienyl ruthenium: an efficient catalyst for the redox isomerization of functionalized allylic alcohols into carbonyl compounds
The catalytic activity of the ruthenium(II) complex [RuCp∗(CH3CN)3][PF6] 1 in the transposition of allylicalcohols into carbonyl compounds, in acetonitrile, is reported. This catalyst has proven to be able to catalyze the transformation of poorly reactive and/or functionalized substrates under smooth conditions.
for C-H allylation of aryl oxazolines using allylic alcohols as the coupling partner. The present transformation unravels the unusual reactivity of allylic alcohols in the synthesis of 4-methyleneisochroman-1-ones and C-H-allylated products. A complete switch in the product selectivity was observed with substrate control and tuning the reaction conditions. The approach employs allylalcohols as an efficient