SmI<sub>2</sub>-Mediated 3-<i>exo-trig</i> Cyclization of β,γ-Unsaturated Carbonyl Compounds: Diastereoselective Synthesis of Cyclopropanols
作者:Mar Martin-Fontecha、Antonia R. Agarrabeitia、Maria J. Ortiz、Diego Armesto
DOI:10.1021/ol101666m
日期:2010.9.17
SmI2-mediated 3-exo-trig cyclizations of β,γ-unsaturatedcarbonylcompounds to generate cyclopropanols are not generally observed processes. The reported examples are limited to β,γ-unsaturatedcarbonylcompounds that possess ester groups conjugated with the alkene unit. The results of the current study show that this cyclization also occurs when other substitution patterns are present on the alkene
Palladium-Catalyzed Intermolecular Heck-Type Reaction of Epoxides
作者:Shenghan Teng、Malcolm E. Tessensohn、Richard D. Webster、Jianrong Steve Zhou
DOI:10.1021/acscatal.8b02029
日期:2018.8.3
palladium-catalyzed intermolecular Heck-type reaction of both cyclic and acyclic epoxides is reported with tolerance of typical polar groups and acidic protons. Suitable alkenes include styrenes, conjugate dienes, and some electron-deficient olefins. In reactions of aliphatic terminal epoxides, ring opening occurs selectively at terminal positions, and stereocenters of epoxides are fully retained. Mechanistic studies