875852-27-0Relevant articles and documents
Copper(i) pyrimidine-2-thiolate cluster-based polymers as bifunctional visible-light-photocatalysts for chemoselective transfer hydrogenation of α,β-unsaturated carbonyls
Zhang, Meng Juan,Young, David James,Ma, Ji Long,Shao, Guo Quan
, p. 14899 - 14904 (2021/05/19)
The photoinduced chemoselective transfer hydrogenation of unsaturated carbonyls to allylic alcohols has been accomplished using cluster-based MOFs as bifunctional visible photocatalysts. Assemblies of hexanuclear clusters [Cu6(dmpymt)6] (1, Hdmpymt = 4,6-dimethylpyrimidine-2-thione) as metalloligands with CuI or (Ph3P)CuI yielded cluster-based metal organic frameworks (MOFs) {[Cu6(dmpymt)6]2[Cu2(μ-I)2]4(CuI)2}n (2), {[Cu6(dmpymt)6]2[Cu2(μ-I)2]4}n (3), respectively. Nanoparticles (NPs) of 2 and 3 served both as photosensitizers and photocatalysts for the highly chemoselective reduction of unsaturated carbonyl compounds to unsaturated alcohols with high catalytic activity under blue LED irradiation. The photocatalytic system could be reused for several cycles without any obvious loss of efficiency.
Enzymatic cascades for the stereo-complementary epimerisation of in situ generated epoxy alcohols
Liu, Yu-Chang,Guo, Chao,Liu, Yan,Wang, Hai-Bo,Wu, Zhong-Liu
, p. 2562 - 2568 (2017/04/03)
The synthesis of optically pure secondary epoxy alcohols from racemic allylic alcohols using a single whole-cell biocatalyst of recombinant Escherichia coli coexpressing three oxidoreductases is described. The cascade involves the concurrent action of a styrene monooxygenase that catalyzes the formation of the chiral epoxy group, and two alcohol dehydrogenases that fulfil the epimerisation of the hydroxy group. Two sets of alcohol dehydrogenases were each applied to couple with styrene monooxygenase in order to realize the epimerisation in a stereo-complementary manner. Excellent enantio- and diastereo-selectivities were achieved for most of the 12 substrates.
Design and synthesis of the basic Cu-doped zeolite X catalyst with high activity in oxidative coupling reactions
Chen, Shengchun,Shao, Zhen,Fang, Zhongxue,Chen, Qun,Tang, Ting,Fu, Wenqian,Zhang, Lei,Tang, Tiandi
, p. 38 - 46 (2016/03/12)
The decarboxylative coupling of cinnamic acids with alcohols and the oxidative coupling of alkenes with aldehydes are typical organic reactions. Considering the characteristics and mechanisms of the reactions, the Cu-doped zeolite-X catalyst (Cu-X) with Lewis basic sites was synthesized and used for the two reactions. Compared with Cu, Cu2O, and CuBr2 catalysts (4-21%), the Cu-X catalyst (99%) shows extraordinary high activity in the decarboxylative coupling of cinnamic acids with alcohols. In addition, the Cu-X catalyst presents excellent performance in the oxidative coupling of alkenes with aldehydes. The strong interaction between Cu+ and the zeolite framework benefits the transformation of Cu2+ and Cu+ in the redox process, enhancing the reaction activity. More importantly, the Lewis basic sites on the Cu-X catalyst could favor the adsorption of the cinnamic acid, resulting in electron-rich density in the C=C bond, and therefore greatly improving the reaction activity.
Acid- and iridium-catalyzed tandem 1,3-transposition/3,1-hydrogen shift/chlorination of allylic alcohols
Vázquez-Romero, Ana,Gómez, Antonio Bermejo,Martín-Matute, Belén
, p. 708 - 714 (2015/06/16)
A method for the selective synthesis of α-chlorocarbonyls from allylic alcohols is presented. The reaction occurs through an acid- and iridium-catalyzed tandem process that combines a 1,3-transposition, a 3,1-hydrogen shift, and a chlorination process, and can be applied to a wide range of α-aromatic and heteroaromatic secondary allylic alcohols. Saturated non-chlorinated ketones or other side-products derived from overchlorination were not detected.
Hydrogen-bond-promoted palladium catalysis: Allylic alkylation of indoles with unsymmetrical 1,3-disubstituted allyl acetates using chiral bis(sulfoxide) phosphine ligands
Du, Le,Cao, Peng,Xing, Junwei,Lou, Yazhou,Jiang, Liyin,Li, Liangchun,Liao, Jian
supporting information, p. 4207 - 4211 (2013/05/09)
A DYKAT die hard: A new class of chiral BiSO-P ligands were effective for an unprecedented palladium-catalyzed asymmetric allylic alkylation of indoles with the racemic title acetates through a dynamic kinetic asymmetric transformation (DYKAT). The hydrogen bond formed between the sulfinyl group of the ligand and NH of indole plays an important role in the reaction. Copyright
