Rhodium‐Catalyzed Parallel Kinetic Resolution of Racemic Internal Allenes Towards Enantiopure Allylic 1,3‐Diketones
作者:Lukas J. Hilpert、Bernhard Breit
DOI:10.1002/anie.201903365
日期:2019.7.15
parallel kinetic resolution of racemic 1,3‐disubstituted allenes by means of a rhodium‐catalyzed addition to 1,3‐diketones furnishing enantiopure allylic 1,3‐diketones is described. Mechanistic experiments demonstrate that the different allene enantiomers react in parallel to either the diastereomeric E‐ or Z‐allylic 1,3‐diketones with the same absoluteconfiguration of the newly formed stereogenic
Palladium‐ and Rhodium‐Catalyzed Dynamic Kinetic Resolution of Racemic Internal Allenes Towards Chiral Pyrazoles
作者:Lukas J. Hilpert、Simon V. Sieger、Alexander M. Haydl、Bernhard Breit
DOI:10.1002/anie.201812984
日期:2019.3.11
resolution (DKR) of racemic allenes leading to N‐allylated pyrazoles is described. Such compounds are of enormous interest in medicinal chemistry as certified drugs and potential drug candidates. The new methods feature high chemo‐, regio‐ and enantioselectivities aside from displaying a broad substrate scope and functional group compatibility. A mechanistic rational accounting for allene racemization and trans‐alkene
Catalyticaminomercuriation of 1-substituted prop-2-ynyl esters and ethers (5) provides a mild, simple, and regiospecific route to the terminal functionalized enamines (6) despite the fact that they are potentially isomerisable to their internal form; hydrolysis of (6) furnishes α-oxyketones (7).
Highly Enantioselective Catalytic Vinylogous Propargylation of Coumarins Yields a Class of Autophagy Inhibitors
作者:Hao Xu、Luca Laraia、Laura Schneider、Kathrin Louven、Carsten Strohmann、Andrey P. Antonchick、Herbert Waldmann
DOI:10.1002/anie.201706005
日期:2017.9.4
A highly enantioselective copper‐catalyzed vinylogous propargylic substitution has been developed. Aromatic and aliphatic propargylic esters react smoothly with substituted coumarins under mild reactionconditions to give the desired products with excellent yields and enantioselectivities. Subsequent single‐step transformations enable the synthesis of a wide range of multifunctional and diverse compounds
<scp>Copper‐Catalyzed</scp>
1,2,
<scp>5‐Trifunctionalization</scp>
of Terminal Alkynes Using
<scp>SR</scp>
as a Transient Directing Group for Radical Translocation
作者:Jian Feng、Fang Zhang、Chenyun Shu、Gangguo Zhu
DOI:10.1002/cjoc.202200092
日期:2022.7.15
The first Cu-catalyzed 1,2,5-trifunctionalization of abundant terminalalkynes is realized by merging hydrogen atom transfer and traceless directing strategy with SR as a transientgroup, delivering highly functionalized aldehydes in moderate to excellent yields with broad substrate scope. The synthetic utility of this method was demonstrated by the gram-scale reaction and downstream transformations
通过将氢原子转移和无痕导向策略与 SR 作为瞬态基团相结合,实现了第一次 Cu 催化的丰富末端炔烃的 1,2,5-三官能化,以中等至优异的产率提供高度官能化的醛,具有广泛的底物范围。该方法的合成效用通过克级反应和所得产物的下游转化得到证明。鉴于在单个反应中高效安装三种不同的官能团,它可以作为一种非常有吸引力的方法,用于从容易获得的起始材料快速组装复杂分子。