Regioselective Ortho Olefination of Aryl Sulfonamide via Rhodium-Catalyzed Direct C–H Bond Activation
作者:Weijia Xie、Jie Yang、Baiquan Wang、Bin Li
DOI:10.1021/jo5015239
日期:2014.9.5
Rh(III)-catalyzed orthoC–H olefination of aryl sulfonamide directed by the SO2NHAc group is reported. This oxidative coupling process is achieved highly efficiently and selectively with a broad substrate scope. The reactions of N-tosylacetamide with acrylate esters afford ortho-alkenylated benzofused five-membered cyclic sulfonamides, whereas styrenes provide the direct diolefination products.
catalysis has yet to be demonstrated. The first iridium-catalyzed alkene–alkyne cross-coupling reactions have been realized under ligand- and additive-free conditions. A wide range of acrylamides and alkynes could be used as coupling partners, providing branched (Z,Z)-butadiene skeletons with excellent site- and stereoselectivities. The utility of this approach is also demonstrated by preparative-scale
The palladium(II)-catalyzed direct oxidative C–H olefination of readily available N-tosylacrylamides and allenoates for the synthesis of dienyl esters is described. The amide and ester moieties both act as the directing groups for the regio- and the stereo-controlled C–H functionalization/cyclization, which was proved by DFT calculations. Molecular oxygen was used as the terminaloxidant in the approach
An image forming material includes an image forming layer containing a water-insoluble and alkali-soluble resin, a light-heat converting agent and a compound represented by the following general formula (1). In general formula (1), R
1
to R
3
independently represent an organic group, where R
1
represents a residue forming a ring containing a N
1
atom, R
2
and R
3
may bond to each other to form a ring or at least one of R
2
and R
3
may bond to R
1
to form a ring and X
−
represents a conjugate base of an organic acid or inorganic acid. The ring containing the N
1
atom is preferably a piperidine ring.
1
A heat mode-applicable image-formation material having high sensitivity and excellent image-forming property, and a novel infrared absorber which can be suitably used in this material. The present invention relates to a substrate carrying thereon an image-formation layer which contains an infrared absorption agent. The agent has at least one surface orientation group in the molecule, and solubility of the image-formation layer in an alkaline aqueous solution is changed by action of radiation in the near-infrared range. Preferable as the infrared absorbing agent is an infrared absorber comprising, in a molecule thereof, a fluorine-containing substituent which have at least 5 fluorine atoms, or a polymethine chain of at least 5 carbon atoms and an alkyl group of at least 8 carbon atoms, said alkyl group being connected to the polymethine chain via any of nitrogen, oxygen and sulfur.