The chemistry of .alpha.-silyl carbonyl compounds. 11. Reaction of .alpha.-silyl esters with grignard reagents: a synthesis of .beta.-keto silanes and ketones. Preparation of the douglas fir tussock moth pheromone
Autoinducer compounds which enhance gene expression in a wide variety of microorganisms, therapeutic compositions and therapeutic methods wherein gene expression within microorganisms is regulated are disclosed.
Regioselective Arene and Heteroarene Functionalization: <i>N</i>-Alkenoxypyridinium Salts as Electrophilic Alkylating Agents for the Synthesis of α-Aryl/α-Heteroaryl Ketones
作者:Rong L. Zhai、Yun S. Xue、Ting Liang、Jia J. Mi、Zhou Xu
DOI:10.1021/acs.joc.8b01388
日期:2018.9.7
electrophilic alkylating agents for the synthesis of α-aryl/heteroaryl ketones has been developed. The method generates alkylating agents from alkynes and N-pyridine oxide followed by site-selective electrophilic substitution with a broad range of arenes and heteroarenes including benzene derivates, phenols, ethers, indoles, pyrroles, furans, and thiophenes in onepot. Kinetic isotope effect measurements
Synthesis of unsymmetrical ketones by applying visible-light benzophenone/nickel dual catalysis for direct benzylic acylation
作者:Patricia E. Krach、Abhishek Dewanji、Tingting Yuan、Magnus Rueping
DOI:10.1039/d0cc01480j
日期:——
benzylic C–H acylation reaction furnishing a variety of unsymmetrical ketones. A benzophenone-derived photosensitizer combined with a nickel catalyst has been established as the catalytic system. Both acid chlorides and anhydrides are able to acylate the benzylic position of toluene and other methylbenzenes. The method offers a valuable alternative to late transition metal catalyzed C–H acylation reactions
Bi(III)-Catalyzed Synthesis of Substituted Furans from Hydroxy-oxetanyl Ketones: Application to Unified Total Synthesis of Shikonofurans J, D, E, and C
Further, it demonstrated the utility of this method in the first enantioselective total synthesis of furyl-hydroquinone-derived biologically potent natural products shikonofurans J, D, E, and C in seven linear steps, starting from readily available building blocks of 2,5-dihydroxy acetophenone and 3-oxetanone employing chiral-phosphoric acid (TRIP)-catalyzed asymmetric prenylation as a key step to induce