Iridium-Catalyzed Coupling Reaction of Primary Alcohols with 2-Alkynes Leading to Hydroacylation Products
作者:Shintaro Hatanaka、Yasushi Obora、Yasutaka Ishii
DOI:10.1002/chem.200902646
日期:2010.2.8
A novel iridium‐catalyzed intermolecularcoupling reaction of primary alcohols or aldehydes with 2‐alkynes was successfully achieved with high regioselectivity to give hydroacylation products such as α,β‐unsaturatedketones in good yields. The mechanistic investigation of the reaction strongly indicated that the coupling proceeds through the initial formation of homoallylic alcohols followed by dehydrogenation
Hydroacylation of 2-butyne from the alcohol or aldehyde oxidation level via ruthenium catalyzed C–C bond forming transfer hydrogenation
作者:Vanessa M. Williams、Joyce C. Leung、Ryan L. Patman、Michael J. Krische
DOI:10.1016/j.tet.2009.03.068
日期:2009.6
alkyne 4a couples to alcohol 1d or aldehyde 2d in good yield to deliver enone 3k as a 5:1 mixture of regioisomers. Thus, intermolecular alkyne hydroacylation is achieved from the alcohol or aldehyde oxidation level. In earlier studies employing the same ruthenium catalyst under slightly different conditions, alkynes were coupled to carbonyl partners from the alcohol or aldehyde oxidation level to furnish
An unusual exo-selective photoenolization/Diels–Alder reaction of electron-rich 2-methylbenzaldehydes and dienophiles containing a benzoyl group at its α position was reported herein. The chiral TADDOL-type ligand plays a key role in this process: (1) accelerating the reaction; (2) controlling the enantioselectivity; and (3) improving and tuning the diastereoselectivity of the reaction.