Acylaromatic compounds ##STR1## (Q: aromatic compound residue; R: straight, branched or cyclic aliphatic group, aromatic group or araliphatic group) are prepared in high yield by a reaction, in the presence of a boron trifluoride complex catalyst, of an aromatic compound with ##STR2## (X: H, Cl, Br; Y: Cl, Br) or with RCOOH in the presence of (XYCHCO).sub.2 O.
Copper-Catalyzed Domino Cycloaddition/CN Coupling/Cyclization/(CH Arylation): An Efficient Three-Component Synthesis of Nitrogen Polyheterocycles
作者:Wenyuan Qian、Hao Wang、Jennifer Allen
DOI:10.1002/anie.201305970
日期:2013.10.11
A cat of all trades: A single copper catalyst promoted up to three reaction steps with separate catalytic cycles in a domino sequence (azide–alkyne cycloaddition/Goldberg amidation/Camps cyclization/(CHarylation)) for the rapid construction of complex heterocycles from three simple components under mild conditions (see scheme). Facile cleavage of the triazole ring enables further elaboration of the
A palladium‐catalyzed enantioselective sequential ring‐opening/cross‐coupling of cyclobutanones is disclosed that provides chiral indanones bearing C3‐quaternary stereocenters. The reaction process involves palladium‐catalyzed nucleophilic addition of cyclobutanones and aryl halides, enantioselective β‐carbon elimination, and intermolecular trapping of a transient σ‐alkylpalladium complex with boronic
Tunable and Chemoselective Syntheses of Dihydroisobenzofurans and Indanones via Rhodium-Catalyzed Tandem Reactions of 2-Triazole-benzaldehydes and 2-Triazole-alkylaryl Ketones
作者:Hongjuan Shen、Junkai Fu、Jianxian Gong、Zhen Yang
DOI:10.1021/ol502617m
日期:2014.11.7
Two novel rhodium(II)-catalyzed tandem reactions were developed for the synthesis of dihydroisobenzofuran and indanone derivatives from 2-triazole-benzaldehydes and 2-triazole-alkylaryl ketones. Dihydroisobenzofuran derivatives were obtained in good yields with high regioselectivities when alcohols were used as nuclophiles in these reactions, whereas the replacement of the alcohol with water resulted
Chemoselectivities in the Platinum-Catalyzed Hydrative Carbocyclizations of Oxo-Alkyne-Nitrile Functionalities
作者:Anupam Mukherjee、Rai-Shung Liu
DOI:10.1021/ol1029047
日期:2011.2.18
Two new hydrativecarbocyclizations of oxa-alkyne-nitrile functionalities are reported to produce distinct nitrogen-containing heterocycles. Protracted heating of oxoalkynyl nitrile substrates with PtCl2/CO/H2O in hot 1,4-dioxane gave 2,3-dihydro-1H-pyrido[1.2-b]-isoquinolin-4(6H)-ones. In this hydration reaction, dicarbonyl nitrile intermediates were isolated efficiently after a brief period, and
据报道,氧-炔烃-腈官能团的两个新的水合碳环化反应产生了独特的含氮杂环。在热的1,4-二恶烷中用PtCl 2 / CO / H 2 O长时间加热氧代炔基腈底物,得到2,3-二氢-1 H-吡啶基[1.2 - b ]-异喹啉-4(6 H)-。在该水合反应中,短暂地有效分离出二羰基腈中间体,然后将其进行基于NHC的交叉安息香偶合,得到螺环醇,并进一步与TfOH反应生成螺环[indene-2,2'-哌啶]。-1,6 ′(3 H)-二酮。