An oximinotrifluoromethylation of unactivated alkenes was developed via trifluoromethyl radical-induced intramolecular remote oximino migration under mild reaction conditions.
novel and atom-economic palladium-catalyzed isomerization-hydrocarbonylative cyclization reaction of 1,5-dienes to 2-alkylidenecyclopentanones has been developed, which provides a rapid and straightforward approach to 2-alkylidenecyclopentanones with high stereoselectivity. The reaction was found to proceed via alkene isomerization and selective hydrocarbonylative cyclization to generate 2-alkylidenecyclopentanones
Bromoetherification of Alkenyl Alcohols by Aerobic Oxidation of Bromide: Asymmetric Synthesis of 2‐Bromomethyl 5‐Substituted Tetrahydrofurans
作者:Akihiko Tomizuka、Katsuhiko Moriyama
DOI:10.1002/adsc.201801557
日期:2019.3.15
An asymmetricsynthesis of 2‐bromomethyl‐5‐substituted tetrahydrofurans via a chiral‐ruthenium‐catalyzed transfer hydrogenation of 3‐butenyl ketones and bromoetherification of chiral pentenyl alcohols was developed. The inhibition of some side reactions furnished the desired products in high yields with high enantioselectivities. In addition, chiral pentenyl alcohols bearing electron‐donating groups
Nickel‐Catalyzed Regioselective Alkenylarylation of γ,δ‐Alkenyl Ketones via Carbonyl Coordination
作者:Roshan K. Dhungana、Vivek Aryal、Doleshwar Niroula、Rishi R. Sapkota、Margaret G. Lakomy、Ramesh Giri
DOI:10.1002/anie.202104871
日期:2021.8.23
which enabled us to difunctionalize unactivated γ,δ-alkenes in ketones with alkenyl triflates and arylboronic esters. The reaction was made feasible by the use of 5-chloro-8-hydroxyquinoline as a ligand along with NiBr2⋅DME as a catalyst and LiOtBu as base. The reaction proceeded with a wide range of cyclic, acyclic, endocyclic and exocyclic alkenylketones, and electron-rich and electron-deficient arylboronate
我们公开了镍催化的反应,该反应使我们能够用三氟甲磺酸烯基酯和芳基硼酸酯对酮中未活化的γ,δ-烯烃进行双官能化。通过使用 5-氯-8-羟基喹啉作为配体以及 NiBr 2· DME 作为催化剂和 LiO t Bu 作为碱,使该反应变得可行。该反应适用于各种环状、无环、环内和环外烯基酮,以及富电子和缺电子芳基硼酸酯。该反应也适用于环状和无环烯基三氟甲磺酸酯。对照实验表明反应的进行需要羰基配位。