Synthesis of aromatic aldehydes via 2-aryl-n,n'-diacyl-4-imidazolines
作者:Jan Bergman、Lars Renström、Birger Sjöberg
DOI:10.1016/0040-4020(80)80230-4
日期:1980.1
Diacylimidazolium ions yield adducts with aromatic compounds. Thus the N,N'-diacetylimidazolium ion and indole gives 1,3-diacetyl-2-(3-indolyl)-4-imidazoline. Less reactive substrates such as thiophene, anisole and 1,3-dimethylbenzene fail to react with this reagent but do form adducts (e.g. 1,3-bis-(trifluoroacetyl)-2-(2-thienyl)-4-imidazoline) with an imidazole/trifluoroacetic anhydride reagent.
Catalytic Enantioselective Direct Aldol Addition of Aryl Ketones to α‐Fluorinated Ketones
作者:Connor J. Thomson、David M. Barber、Darren J. Dixon
DOI:10.1002/anie.201916129
日期:2020.3.23
catalytic enantioselective synthesis of α-fluorinated chiral tertiary alcohols from (hetero)aryl methyl ketones is described. The use of a bifunctional iminophosphorane (BIMP) superbase was found to facilitate direct aldol addition by providing the strong Brønsted basicity required for rapid aryl enolate formation. The new synthetic protocol is easy to perform and tolerates a broad range of functionalities
描述了由(杂)芳基甲基酮催化合成α-氟化手性叔醇的对映体。发现使用双功能亚氨基正膦(BIMP)超碱可通过提供快速形成芳基烯醇酸酯所需的强布朗斯台德碱度,促进直接添加羟醛。新的合成方案易于执行,并具有高对映选择性(高达> 99:1 er),可耐受各种功能和杂环。已经证明了多克的可扩展性以及催化剂的回收和再循环。1 H NMR研究表明,与现有技术水平的催化体系相比,BIMP催化的速率提高了1400倍。通过合成各种对映体丰富的结构单元和杂环,突出了醛醇产品的实用性,其中包括:
Two Classes of Enzymes of Opposite Stereochemistry in an Organism: One for Fluorinated and Another for Nonfluorinated Substrates
observed in the reduction of hinderedketones such as isopropyl ketone, while the stereoselectivity was inverted in the reduction of ketones with electron-withdrawing atoms such as chlorine. The mechanism for the inversion in stereochemistry was investigated by enzymatic studies. Several enzymes with different stereoselectivities were isolated; one of them catalyzed the reduction of methyl ketones, and another
3,4-Di-substituted cyclobutene-1,2-diones as CXC-chemokine receptor ligands
申请人:Schering Corporation
公开号:US20040106794A1
公开(公告)日:2004-06-03
There are disclosed compounds of the formula
1
or a pharmaceutically acceptable salt or solvate thereof which are useful for the treatment of chemokine-mediated diseases such as acute and chronic inflammatory disorders and cancer.
Enantioselective Synthesis of Trifluoromethyl α,β-Unsaturated δ-Lactones via Vinylogous Aldol-Lactonization Cascade
作者:Simone Crotti、Nicola Di Iorio、Andrea Mazzanti、Paolo Righi、Giorgio Bencivenni
DOI:10.1021/acs.joc.8b01672
日期:2018.10.19
by a bifunctional tertiary amine, provides an efficient application of the vinylogous reactivity of alkylidene oxindoles for the preparation of enantioenriched trifluoromethylated α,β-unsaturated δ-lactones.