Directed Copper-Catalyzed Intermolecular Heck-Type Reaction of Unactivated Olefins and Alkyl Halides
作者:Chunlin Tang、Ran Zhang、Bo Zhu、Junkai Fu、Yi Deng、Li Tian、Wei Guan、Xihe Bi
DOI:10.1021/jacs.8b10874
日期:2018.12.12
A new type of intermolecular alkylative olefination of unactivated olefins and alkyl halides has been realized for the first time. This copper-promoted Heck-type reaction employs a directing-group strategy to efficiently produce the coupled alkyl olefin products with excellent regio- and stereoselectivity. A broad substrate scope including 1°, 2°, and 3° alkyl bromides and various nonactivated alkenes
Oxidase catalysis via aerobically generated hypervalent iodine intermediates
作者:Asim Maity、Sung-Min Hyun、David C. Powers
DOI:10.1038/nchem.2873
日期:2018.2
autoxidation to aerobically generate hypervalentiodinereagents for a broad array of substrate oxidation reactions. The use of aryl iodides as mediators of aerobic oxidation underpins an oxidase catalysis platform that couples substrate oxidation directly to O2 reduction. We anticipate that aerobically generated hypervalentiodinereagents will expand the scope of aerobic oxidation chemistry in chemical
scope of the reaction with respect to enamide and enecarbamate substrates by using diethyl 2‐bromomalonate for the alkylationreaction was explored, followed by an investigation of the scope of alkylating reagents used to react with the enamides and enecarbamates. The results indicated that reaction takes place with quite broad substrate scope, however, tertiary enamides with an internal CC double bond
Convergent and Diastereoselective Synthesis of the Polycyclic Pyran Core of Saudin
作者:Uttam K. Tambar、Taichi Kano、John F. Zepernick、Brian M. Stoltz
DOI:10.1021/jo061236+
日期:2006.10.1
natural product saudin was found to induce hypoglycemia in mice and, therefore, could be an appealing lead structure for the development of new agents to treat diabetes. A diastereoselective tandem Stille-oxa-electrocyclization reaction has been developed which provides access to the core structure of saudin in a rapid and convergent manner. This new reaction has been extended to the convergent preparation