Cobalt-Catalyzed Cross-Coupling Reactions of Heterocyclic Chlorides with Arylmagnesium Halides and of Polyfunctionalized Arylcopper Reagents with Aryl Bromides, Chlorides, Fluorides and Tosylates
A range of aromatic organocopper or organomagnesium compounds undergo smooth cross-coupling reactions with aryl bromides, chlorides, fluorides and tosylates, leading to polyfunctionalized aromatics or heterocycles in the presence of cobalt salts (5-7.5 mol%) as catalysts. Very mild reaction conditions are needed and, in the case of cross-coupling with organocopper compounds, Bu4NI (1 equiv) and 4-fluorostyrene (20 mol%) are essential as promoters for successful couplings.
Site-selective cross-coupling of dihalogenated acetophenones and dihalogenated benzophenones with aryl titanium reagents under catalyst control
作者:He Zhang
DOI:10.1007/s00706-023-03101-3
日期:2023.8
products viapalladium-catalyzedcross-coupling of aryl titanium reagents and dihalogenated benzophenone or dihalogenated acetophenone scaffolds is described. The method uses Pd(dba)2 as catalyst and 2-diisopropylphosphino-2′-dimethylaminobiphenyl as ligand in THF/NMP (3:1) (4.0 cm3) for 10 h at 0 °C. The system can tolerate various functional groups such as aldehydes, esters, etc. In the process of optimizing
描述了一种通过芳基钛试剂和二卤代二苯甲酮或二卤代苯乙酮支架的钯催化交叉偶联选择性形成C2偶联产物的方法。该方法使用Pd(dba) 2作为催化剂,2-二异丙基膦-2'-二甲基氨基联苯作为配体,在THF/NMP (3:1) (4.0 cm 3 )中于0℃反应10小时。该体系可以耐受醛、酯等多种官能团。在优化偶联方法的过程中,我们还合成了两种新的配体,并制备了五种新的单取代芳香酮,这在本文中为首次出现。 图形概要
Process for preparing alpha,alpha-disubstituted aromatics and heteroaromatics as cognition enhancers
申请人:THE DU PONT MERCK PHARMACEUTICAL COMPANY
公开号:EP0532054A1
公开(公告)日:1993-03-17
Cognitive defeciencies or neurological dysfunction in mammals are treated with α,α-disubstituted aromatic or heteroaromatic compounds. The compounds have the formula:
or a salt thereof
wherein X and Y are taken together to form a saturated or unsaturated carbocyclic or heterocyclic first ring and the shown carbon in said ring is α to at least one additional aromatic ring or heteroaromatic ring fused to the first ring;
one of Het¹ or Het² is 2, 3, or 4-pyridyl or 2, 4, or 5-pyrimidinyl and the other is selected from
(a) 2, 3, or 4-pyridyl,
(b) 2, 4, or 5-pyrimidinyl,
(c) 2-pyrazinyl,
(d) 3, or 4-pyridazinyl,
(e) 3, or 4-pyrazolyl,
(f) 2, or 3-tetrahydrofuranyl, and
(g) 3-thienyl.