Step saver: Carbonyl groups with lower reactivities can be transformed in the presence of more reactive ones by treatment with PPh3 (or PEt3) and TMSOTf prior to the reaction (see scheme; TMS=trimethylsilyl, Tf=trifluoromethanesulfonyl). This methodology can be applied to reduction and alkylation reactions, and enabled the short asymmetric totalsynthesis of (+)‐centrolobine with the highest overall
Cycloalumination of cycloalkynes with triethylaluminum catalyzed by zirconium complexes
作者:V. A. D’yakonov、L. F. Galimova、T. V. Tyumkina、U. M. Dzhemilev
DOI:10.1134/s1070428012010010
日期:2012.1
Cycloalumination of cycloalkynes with triethylaluminum in the presence of zirconium complexes was performed for the first time, and new bicyclic aluminacyclopentenes were obtained in 74-94% yield.