A blue-light-promoted carbon-carbon double bondisomerization in the absence of any photoredox catalyst is reported. It provides rapid access to a series of quinolines in good to excellent yields under simple aerobic conditions. The protocol is direct, catalyst-free and operationally convenient.
Tandem Catalysis by Lipase in a Vinyl Acetate-Mediated Cross-Aldol Reaction
作者:Manjeet Kumar、Bhahwal A. Shah、Subhash C. Taneja
DOI:10.1002/adsc.201000980
日期:2011.5
The lipase Novozym435 (0.6% w/w) was used in tandem with organocatalysts in a first vinyl/isopropenyl acetate‐mediated aldol reaction. The reaction was facilitated through the lipase‐catalyzed in situ generation of acetaldehyde/acetone. The important features of the present methodology include the mild and facile reaction conditions, regenerability of the lipase, comparatively high yields and minimal
A series of functionalized ionicliquids (FILs) incorporated with chiral-pyrrolidine unit have been synthesized and tested as reusable organocatalysts for direct aldolreactions. FIL 1b in combination with acetic acid and water as additives could effectively catalyze direct aldolreactions of various ketone donors in high yields and the FIL catalyst was easily recycled and reused for six times with
Asymmetric bifunctional primary aminocatalysis on magnetic nanoparticles
作者:Sanzhong Luo、Xiaoxi Zheng、Jin-Pei Cheng
DOI:10.1039/b812958d
日期:——
MNP-supported chiral primary amine catalysts were developed and evaluated as asymmetricbifunctional enamine catalysts in direct aldolreaction, showing essentially unchanged activity and stereoselectivity after 11 recycles.
The Zn–proline complex is shown to catalyze the aldolreaction of acetone and a wide range of arenecarbaldehydes in aqueous media, accepting even deactivated arenecarbaldehydes such as methoxybenzaldehydes in good yields. Enantiomeric excesses of up to 56 % could be obtained with 5 mol-% of the catalyst at room temperature, and up to 66 %