Synthesis of Benzosiloles by Intramolecular anti-Hydroarylation via ortho-C–H Activation of Aryloxyethynyl Silanes
摘要:
Straightforward synthesis of benzosiloles was achieved by the invention of Pd/acid-catalyzed intramolecular anti-hydroarylation of aryloxyethynyl(aryl)-silanes via ortho-C-H bond activation. The aryloxy group bound to the ethynyl carbon is the key factor for this transformation.
1-(Alkylsulfonyl)- and 1-(arylsulfonyl)benzotriazoles react with sodium azide in acetonitrile to give the corresponding alkanesulfonyl and arenesulfonyl azides.
Tandem organometallic addition reactions to N-methoxy-ureas and urethanes in the preparation of unsymmetrical and symmetrical ketones
作者:Dennis J. Hlasta、John J. Court
DOI:10.1016/s0040-4039(00)99576-5
日期:——
The use of the novel reagents 1a–c for the synthesis of ketones in a one pot reaction is described. An interesting leaving group effect was discovered in the fragmentation of the proposed complexes 2 to the intermediate N-methoxyamides 3.
The addition reaction of lithiumreagents to the 4 position of 2‐chloropyrimidine or 2‐chloroquinazoline followed by oxidation of the resultant dihydro intermediate product is a powerful tool for the synthesis of 4‐substituted 2‐chloropyrimidines or 2‐chloroquinazolines. 4‐Vinyl derivatives undergo a conjugate nucleophilic addition across the vinyl group. A nucleophilic displacement of chloride in
Functionalized organolithium reagents in the synthesis of chiral ligands for catalytic enantioselective addition of diethylzinc to aldehydes
作者:Georgi M. Dobrikov、Irena Philipova、Rositsa Nikolova、Boris Shivachev、Angel Chimov、Vladimir Dimitrov
DOI:10.1016/j.poly.2012.06.090
日期:2012.9
were prepared and added to chiral bicyclic ketones (1R-(+)-camphor analogue 2 and 1R-(−)-fenchone 3), resulting in the preparation of a small “library” of chiral aminoalcohols able to serve as ligands in metal mediated asymmetric synthesis. The configuration of the chiral ligands was approved by applying advanced NMR experiments. The absoluteconfigurations of 1,2-disubstituted planar chiral ferrocene-based