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
Synthesis of maleimide-based enediynes with cyclopropane moieties for enhanced cytotoxicity under normoxic and hypoxic conditions
作者:Wenbo Wang、Haotian Lu、Mengsi Zhang、Hailong Ma、Xiaoyu Cheng、Yun Ding、Aiguo Hu
DOI:10.1039/d1tb00142f
日期:——
from MSC would rearrange to new diradicals with much longer separation and weaker interactions between two radical centers. The computational study suggested a low energy barrier (4.4 kcal mol−1) for the radical rearrangement through the cyclopropane ring-opening process. Thermolysis experiments confirmed that this radical rearrangement results in the formation of a new diradical intermediate, followed
The trialkylborane/O2-mediated reaction of propargyl acetates having a tributylstannyl group at an alkyne terminus with aldehydes in a THF–H2O solvent system gave anti-δ,δ-disubstituted homoallylic alcohols with good to high diastereoselectivity. Intriguingly, two alkyl groups derived from trialkylborane were embedded into the reaction product. The trialkylborane plays a key role not only as a radical
由三烷基硼烷/ O 2介导的炔烃末端具有三丁基锡烷基的炔丙基乙酸酯与醛在THF-H 2 O溶剂体系中的反应可得到具有良好或高非对映选择性的抗-δ,δ-二取代均烯丙基醇。有趣的是,两个衍生自三烷基硼烷的烷基被嵌入反应产物中。三烷基硼烷不仅起自由基引发剂的作用,而且作为烷基自由基的来源也起着关键作用。