Synthesis and structure of biologically active ferrocenylalkyl polyfluoro benzimidazoles
摘要:
The title compounds were synthesized in quantitative yields by interacting cl-hydroxyalkyl ferrocenes with polyfluoroalkyl benzimidazoles in an aqueous-organic medium in the presence of HBF4. The resulting diastereomers and enantiomers were resolved using HPLC on silica bonded chiral stationary phases based on chiral cyclodextrins and cyclic antibiotics. The X-ray determination of molecular and crystal structure of 1-ferrocenylmethyl-2-(trifluoromethoxyfluoromethyl)benzimidazole (1) was carried out. (C) 1999 Elsevier Science S.A. All rights reserved.
Modified Hydroborate Agent: (2,2′-Bipyridyl)(tetrahydroborato)zinc Complex, [Zn(BH<sub>4</sub>)<sub>2</sub>(bpy)], as a New, Stable, Efficient Ligand-Metal Hydroborate and Chemoselective Reducing Agent
作者:Behzad Zeynizadeh
DOI:10.1246/bcsj.76.317
日期:2003.2
rato)zinc complex, [Zn(BH4)2(bpy)], is a new white stable compound which has been used for efficient reduction of variety of carbonyl compounds such as aldehydes, ketones, acyloins, α-diketones and α,β-unsaturated carbonyl compounds (1,2-reduction) to their corresponding alcohols in acetonitrile at room temperature. Excellent chemoselectivity was also observed for the reduction of aldehydes over ketones
Hydrosilylation of aldehydes and ketones catalysed by nickel acetate and tricyclohexylphosphine as the catalytic system was demonstrated using polymethylhydrosiloxane as a cheap reducing reagent.
使用聚甲基氢硅氧烷作为廉价还原剂,展示了由乙酸镍和三环己基膦组成的催化系统催化醛和酮的氢硅化反应。
1-D manganese(<scp>ii</scp>)-terpyridine coordination polymers as precatalysts for hydrofunctionalisation of carbonyl compounds
作者:Guoqi Zhang、Haisu Zeng、Sihan Li、Jahvon Johnson、Zixuan Mo、Michelle C. Neary、Shengping Zheng
DOI:10.1039/c9dt04637b
日期:——
importance and shows potential in replacing precious metal catalysis. In this work, we revealed catalytic hydroboration and hydrosilylation of ketones and aldehydes achieved by a structurally defined manganese(ii) coordination polymer (CP) as a precatalyst under mild conditions. The manganese-catalysed methodology can be applied to a range of functionalized aldehydes and ketones with turnover numbers (TON)
Reaction condition controlled nickel(<scp>ii</scp>)-catalyzed C–C cross-coupling of alcohols
作者:Meng-Juan Zhang、Hong-Xi Li、David J. Young、Hai-Yan Li、Jian-Ping Lang
DOI:10.1039/c9ob00418a
日期:——
methodology employing a Ni(II) 4,6-dimethylpyrimidine-2-thiolate cluster catalyst under different reaction conditions. This catalyst could tolerate a wide range of substrates and exhibited a high activity for the annulation reaction of secondary alcohols with 2-aminobenzyl alcohols to yield quinolines. This work is an example of precise chemoselectivity control by careful choice of reaction conditions.