62291-44-5Relevant academic research and scientific papers
Enantioselective Copper-Catalyzed Desymmetrization of 1,3-Diketones Involving Borylation of Styrenes
Zheng, Purui,Han, Xiaoyu,Hu, Jiao,Zhao, Xiaoming,Xu, Tao
supporting information, p. 6040 - 6044 (2019/08/27)
A copper-catalyzed intramolecular enantioselective and diastereoselective borylative coupling of styrenes and ketones was achieved by merging desymmetrization strategy and olefin difunctionalization. The reaction proceeds through an initial enantioselective borylcupration of styrenes, followed by a highly selective direct addition to 1,3-diketones. The bicyclic scaffolds with three chiral carbon centers, including two tetrasubstituted carbons, were generated in excellent yields, diastereoselectivities, and enantioselectivities. This catalytic tandem reaction has great potential for further synthetic application of the chiral polycyclic compounds, because of the versatility of the functional groups in the products.
Copper-Catalyzed Modular Amino Oxygenation of Alkenes: Access to Diverse 1,2-Amino Oxygen-Containing Skeletons
Hemric, Brett N.,Chen, Andy W.,Wang, Qiu
, p. 1468 - 1488 (2019/01/25)
Copper-catalyzed alkene amino oxygenation reactions using O-acylhydroxylamines have been achieved for a rapid and modular access to diverse 1,2-amino oxygen-containing molecules. This transformation is applicable to the use of alcohols, carbonyls, oximes, and thio-carboxylic acids as nucleophiles on both terminal and internal alkenes. Mild reaction conditions tolerate a wide range of functional groups, including ether, ester, amide, carbamate, and halide. The reaction protocol allows for starting with free amines as the precursor of O-benzoylhydroxylamines to eliminate their isolation and purification, contributing to broader synthetic utilities. Mechanistic investigations reveal the amino oxygenation reactions may involve distinct pathways, depending on different oxygen nucleophiles.
1-methyl-1-vinyl- and 1-methyl-1-(prop-2-enyl)silacyclobutane: Reagents for palladium-catalyzed cross-coupling reactions of aryl halides
Denmark, Scott E.,Wang, Zhigang
, p. 999 - 1003 (2007/10/03)
1-Methyl-1-vinylsilacyclobutane (1) and 1-methyl-1(prop-2- enyl)silacyclobutane (2) undergo rapid and high yielding cross-coupling with aromatic halides. Many different substituents and patterns on the aromatic moiety are tolerated. All reactions can be r
Polycyclen vom Triangulen-Typ, II. Dreifach ortho-verbrueckte Triphenylmethan-Derivate
Hellwinkel, Dieter,Aulmich, Gerhard,Melan, Michael
, p. 86 - 108 (2007/10/02)
The syntheses of the new polycyclic systems 12,12c-dihydro-4,4,8,8,12,12-hexamethyl-4H,8H-dibenzopyrene (8), 11,11c-dihydro-7,7,11,11-tetramethyl-7H-naphthaceanthrylene (43), and 9,13b-dihydro-5,5,9,9-tetramethyl-1,13-ethano-5H-naphthanthracene (44) are reported.The spectroscopic data are in accordance with a pyramidal C3v-structure for 8, a similar Cs-structure for 43, and a flexible, helical C1-structure for 44.Furthermore, 8 can be transformed into its rapidly inverting pyramidal anion 11 and into its cation 9 which most probably is planar.
