The allylation of heterobicyclicalkenes is presented for the first time. By using an inexpensive cobalt salt as the catalyst and easy‐to‐handle potassium allyltrifluoroborate as the reagent, an unprecedented formal hydroallylation of the bicyclic alkenes is realized in high efficiency. When a chiral cobalt/bis(phosphine) complex is used instead, the alternative ring‐opening products can be obtained
Copper-Catalyzed Borylacylation of Activated Alkenes with Acid Chlorides
作者:Yuan Huang、Kevin B. Smith、M. Kevin Brown
DOI:10.1002/anie.201707323
日期:2017.10.16
for the copper‐catalyzedborylacylation of activated alkenes is presented. The reaction involves borylcupration of the alkene, followed by capture of the generated alkyl–copper intermediate with an acid chloride. The reactions operated with low catalyst loading and generally occurre within 15 min at room temperature for a range of activated alkenes. In the case of vinyl arenes, enantioselective borylacylation
Convenient Synthesis of meso-Cyclohexa-1,3-dienes by One-Pot Two-Step Deoxygenation of 7-Oxabicyclo[2.2.1]hept-2-enes
作者:Ryo Irie、Tomotsugu Yano、Takashi Fujishima
DOI:10.1055/s-0029-1218618
日期:2010.3
Iron(III) hydroxide oxide was found to be an efficient catalyst for the ring-opening reaction of 5,6-cis-disubstituted 7-oxabicyclo[2.2.1]hept-2-enes with acetyl bromide in dichloromethane at room temperature to give cyclohexene derivatives with leaving groups (acetoxy or bromo groups) disposed on each allylic position. A successive one-pot treatment of the reaction mixture with zinc powder and tetrahydrofuran