Photocontrolled Cobalt Catalysis for Selective Hydroboration of α,β‐Unsaturated Ketones
作者:Frédéric Beltran、Enrico Bergamaschi、Ignacio Funes‐Ardoiz、Christopher J. Teskey
DOI:10.1002/ange.202009893
日期:2020.11.16
In this way, we bias the reaction down two divergent pathways, giving contrasting products in the catalytic hydroboration of α,β‐unsaturated ketones. This includes direct access to previously elusive cyclic enolborates, via 1,4‐selective hydroboration, providing a straightforward and stereoselective route to rare syn‐aldol products in one‐pot. DFT calculations and mechanistic experiments confirm two
Reductive cleavage of benzyl ethers with lithium naphthalenide. A convenient method for debenzylation
作者:Hsing-Jang Liu、Judy Yip、Kak-Shan Shia
DOI:10.1016/s0040-4039(97)00345-6
日期:1997.3
An operationally simple, high-yielding and highly chemoselective procedure has been developed for the conversion of benzyl ethers to the corresponding alcohols, using lithium naphthalenide as the reagent.
Remarkably simple IrIII catalysts enable the isomerization of primary and sec‐allylicalcohols under very mild reaction conditions. X‐ray absorption spectroscopy (XAS) and mass spectrometry (MS) studies indicate that the catalysts, with the general formula [Cp*IrIII], require a halide ligand for catalytic activity, but no additives or additional ligands are needed.
非常简单的Ir III催化剂可在非常温和的反应条件下实现伯醇和仲烯丙基醇的异构化。X射线吸收光谱(XAS)和质谱(MS)研究表明,通式为[Cp * Ir III ]的催化剂需要卤化物配体才能发挥催化活性,但不需要添加剂或其他配体。
A Facile Synthesis of α-Fluoro Ketones Catalyzed by [Cp*IrCl2]2
isomerized into enolates (enols) by [Cp*IrCl2]2. The enolates react with Selectfluor present in the reaction media. This method produces α-fluoroketones as single constitutional isomers in high yields. iridium - fluorine - isomerization - alcohols - fluoro ketones
Diastereoselectivity in the [2,3]-sigmatropic rearrangement of substituted allylic N,N-dialkylamidosulfoxylates. X-ray molecular structure of [(1′) S*, (S)S*]-(2′E)-4-[[3′-(4″-bromophenyl)-1′-methyl-2′-propenyl]sulfinyl]-morpholine
作者:Jean-Bernard Baudin、Itka Bkouche-Waksman、Georges Hareau、Sylvestre A. Julia、Robert Lorne、Claudine Pascard
DOI:10.1016/s0040-4020(01)82318-8
日期:1991.8
By the reaction with three N,N-dialkylamidosulfenyl chlorides 2 bearing representative sizes for the R groups on the nitrogen atom, several substituted secondary E or Z allylic alcohols (1a-h) have been converted into the corresponding pairs of diastereoisomeric allylic sulfinamides (3+-3′a-v), whose ratios have been determined by 1H NMR spectroscopy. Five cases of entirely diastereoselective [2,3]-sigmatropic
通过与三个N,N-二烷基酰胺基亚磺酰氯2(在氮原子上具有代表性的R基团)反应,一些取代的仲E或Z烯丙基醇(1a-h)已转化为相应的非对映异构烯丙基亚磺酰胺(3 + -3'av),其比例已通过1 H NMR光谱测定。已经观察到五例完全非对映选择性[2,3]-σ重排的情况。