Catalytic Enantio- and Diastereoselective Cyclopropanation of 2-Azadienes for the Synthesis of Aminocyclopropanes Bearing Quaternary Carbon Stereogenic Centers
作者:Xinxin Shao、Steven J. Malcolmson
DOI:10.1021/acs.orglett.9b02692
日期:2019.9.20
We report the catalyticenantio- and diastereoselective preparation of aminocyclopropanes by the cyclopropanation of terminal and (Z)-internal 2-azadienes with donor/acceptor carbenes derived from α-diazoesters. The resulting cyclopropanes bear quaternary carbon stereogenic centers vicinal to the amino-substituted carbon and are formed as a single diastereomer in up to 99:1 er and 97% yield with 0
我们报道了通过末端和( Z )-内部2-氮杂二烯与源自α-重氮酯的供体/受体卡宾的环丙烷化,催化对映和非对映选择性制备氨基环丙烷。所得环丙烷带有与氨基取代碳相邻的季碳立构中心,并以高达 99:1 er 和 97% 产率形成单一非对映异构体,其中使用 0.5 mol% 的 Rh 2 (DOSP) 4 和仅1.5当量的重氮试剂。内部氮杂二烯的转化提供了具有三个连续立体中心的环丙烷。
Reactions of Dry Arenediazoniumo-Benzenedisulfonimides with Triorganoindium Compounds
The reduction of nitroarenes to anilines as well as azobenzenes to hydrazobenzenes using a single base-metal catalyst is reported. The hydrogenation reactions are performed with an air-and moisture-stable manganese catalyst and proceed under relatively mild reaction conditions. The transformation tolerates a broad range of functional groups, affording aniline derivatives and hydrazobenzenes in high
Active Ester Functionalized Azobenzenes as Versatile Building Blocks
作者:Sven Schultzke、Melanie Walther、Anne Staubitz
DOI:10.3390/molecules26133916
日期:——
conditions for the introduction of NHS esters to azobenzenes and diazocines has been established. Yields were consistently high with very few exceptions. The NHS functionalized azobenzenes react with primary amines quantitatively. These amines are ubiquitous in biological systems and in material science.
Optical Control of Mitosis with a Photoswitchable Eg5 Inhibitor
作者:Anna C. Impastato、Andrej Shemet、Nynke A. Vepřek、Gadiel Saper、Henry Hess、Lu Rao、Arne Gennerich、Dirk Trauner
DOI:10.1002/anie.202115846
日期:2022.2.21
The opticalcontrol of a mitotic kinesin, Eg5, was achieved through an azobenzene analog of EMD-534085. Under UV light conditions, HeLa cells undergo mitotic arrest, as evidenced by the formation of a monopolar spindle.