Converting gem-Dimethyl Groups into Cyclopropanes via Pd-Catalyzed Sequential C−H Activation and Radical Cyclization
摘要:
A novel route to the synthesis of cyclopropane derivatives is described. 1,1-Dimethyls in 2-(1,1-dimethylalkyl)dimethyloxazolines are first converted into 1,3-diiodide derivatives via Pd-catalyzed sequential C-H activation and then radically cyclized to provide 2-(1-alkylcylclopropyl)dimethyloxazolines. The use of EtOAc as a solvent is crucial for the diiodination of the functionalized substrates.
ordinary Koch-Haaf carboxylation conditions the tertiary alcohol, 2-(1-adamantyl)-2-propanol (4) yields only the rearranged carboxylicacid, 3-isopropyl-1-adamantane carboxylicacid (5). Mechanistic evidence is presented which indicates that the rearrangement proceeds via intermolecular hydride shifts. A variety of synthetic approaches to the unrearranged 2-(1-adamantyl)-2-methylpropionic acid (1) are described
Bicycloheteroaryl compounds as P2X7 modulators and uses thereof
申请人:Kelly G. Michael
公开号:US20060217448A1
公开(公告)日:2006-09-28
Bicycloheteroaryl compounds are disclosed that have a formula represented by the following:
The compounds may be prepared as pharmaceutical compositions, and may be used for the prevention and treatment of a variety of conditions in mammals including humans, including by way of non-limiting example, pain, inflammation, traumatic injury, and others.
Chemical Transformations of Tetracyclo[3.3.1.13,7.01,3]decane (1,3-Dehydroadamantane): VI. Reactions of 1,3-Dehydroadamantane with Carboxylic Acid Chlorides
作者:V. M. Mokhov、G. M. Butov、K. R. Saad
DOI:10.1134/s1070428018060039
日期:2018.6
saturated carboxylic acid chlorides to give the corresponding 1-acyl-3-chloroadmantanes as the major products. In some cases, minor products of insertion into the Cα–H bond of acyl chloride were formed. The reactions of 1,3-dehydroadamantane with aromatic (heteroaromatic) carboxylic acid chlorides selectively afforded aryl (hetaryl) 3-chloroadamantan-1-yl ketones. The described reactions provide a
Enantioselective C–H Lactonization of Unactivated Methylenes Directed by Carboxylic Acids
作者:Marco Cianfanelli、Giorgio Olivo、Michela Milan、Robertus J. M. Klein Gebbink、Xavi Ribas、Massimo Bietti、Miquel Costas
DOI:10.1021/jacs.9b12239
日期:2020.1.22
hydroxylation product. Here we show that a Mn-catalyzed CH oxidation directed by carboxylicacids can overcome these challenges to yield γ-lactones in high enantiomeric excess (up to 99%) using hydrogen peroxide as oxidant and a Brønsted acid additive under mild conditions and short reaction times. Coordination of the carboxylicacid group to the bulky Mn complex ensures the rigidity needed for high enantioselectivi-ty
Bicycloheteroaryl Compounds as P2X7 Modulators and Uses Thereof
申请人:Kelly G Michael
公开号:US20080039478A1
公开(公告)日:2008-02-14
Bicycloheteroaryl compounds are disclosed that have a formula represented by the following:
The compounds may be prepared as pharmaceutical compositions, and may be used for the prevention and treatment of a variety of conditions in mammals including humans, including by way of non-limiting example, pain, inflammation, traumatic injury, and others.