The first primary aminocatalytic direct cross-aldol reaction of acetaldehyde is presented. Among the various vicinal diamines screened, the L-tert-leucine derivative 1c in conjunction with (H4SiW12O40)0.25 was identified as the optimal catalyst; good catalytic activity (up to 99 % yield in 4 h), and high enantioselectivities (up to 92 % ee) were achieved for a range of donors, including aromatic aldehydes
Organocatalytic Direct Asymmetric Crossed-Aldol Reactions of Acetaldehyde in Aqueous Media
作者:Yupu Qiao、Qiankun Chen、Sirong Lin、Bukuo Ni、Allan D. Headley
DOI:10.1021/jo302442g
日期:2013.3.15
dioctylamino group in the presence of a newly developed ionic liquid supported (ILS) benzoic acid as cocatalyst, is shown to be an effective catalytic system for the asymmetricdirectcrossed-aldolreaction of acetaldehyde in aqueous media using brine. For the reactions studied, the catalyst loading could be reduced to 5 mol %; high yields (up to 97%) and high enantioselectivities (up to 92% ee) were also
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
Selective photocatalytic C–C bond cleavage under ambient conditions with earth abundant vanadium complexes
作者:Sarifuddin Gazi、Wilson Kwok Hung Ng、Rakesh Ganguly、Adhitya Mangala Putra Moeljadi、Hajime Hirao、Han Sen Soo
DOI:10.1039/c5sc02923f
日期:——
Chemoselective aliphatic carbon–carbon bond activation photocatalyzed by vanadium oxo complexes under ambient conditions and visible light.
在环境条件下和可见光下,钒氧配合物光催化的化学选择性脂肪族碳-碳键活化。
[EN] SELECTIVE CARBON-CARBON BOND CLEAVAGE BY EARTH ABUNDANT VANADIUM COMPOUNDS UNDER VISIBLE LIGHT PHOTOCATALYSIS<br/>[FR] CLIVAGE SÉLECTIF DES LIAISONS CARBONE-CARBONE PAR DES COMPOSÉS DE VANADIUM ABONDANTS SUR TERRE SOUS L'EFFET D'UNE PHOTOCATALYSE ACTIVÉE PAR UNE LUMIÈRE VISIBLE
申请人:UNIV NANYANG TECH
公开号:WO2016126207A1
公开(公告)日:2016-08-11
Provided herein a vanadium(V) complex of formula I, where R1 to R8 are as defined herein. Also provided herein are reactions making use of the vanadium(V) complex of formula I, such as selective sp3-sp3 carbon-carbon bond cleavage under visible light photocatalysis and photodegradation of lignin.