Via a strategy of asymmetricreductive desymmetrization, chiral cis-epoxy naphthoquinols with multiple contiguous stereocenters and functional groups were synthesized with excellent enantioselectivities (96–99% ee) and diastereoselectivities (8/1–15/1). A combined asymmetric hydrogenation/transfer hydrogenation mechanism was proposed based on experimental results.
Replacing Conventional Carbon Nucleophiles with Electrophiles: Nickel-Catalyzed Reductive Alkylation of Aryl Bromides and Chlorides
作者:Daniel A. Everson、Brittany A. Jones、Daniel J. Weix
DOI:10.1021/ja301769r
日期:2012.4.11
general method is presented for the synthesis of alkylated arenes by the chemoselective combination of two electrophilic carbons. Under the optimized conditions, a variety of aryl and vinyl bromides are reductively coupled with alkyl bromides in high yields. Under similar conditions, activated aryl chlorides can also be coupled with bromoalkanes. The protocols are highly functional-group tolerant (−OH,
High pressure, temperature, and solvent effect on the Diels–Alder cycloaddition reaction between thiobenzophenone and cyclopentadiene
作者:Dmitry A. Kornilov、Aliya A. Kornilova、Alexey A. Shulyatiev、Oleg V. Anikin、Akhat G. Mustafin
DOI:10.1002/kin.21685
日期:2023.12
influence on the Diels–Alder reaction rate of thiobenzophenone with cyclopentadiene have been obtained. Activation enthalpies, entropies, volumes, and reaction volumes in several solvents have been determined. The activation entropies and volumes of the Diels–Alder reaction of thiobenzophenone with cyclopentadiene are close to the corresponding activation parameters of Diels–Alder reactions involving