A Diels–Alderreaction in a fluorousbiphasicsystem was accelerated by a hexamericcapsule of resorcinarenebearingfluorousfeet. The reaction takes place predominantly within the capsule, which can be recovered as a fluorous solution and recycled after simple decantation.
Scandiumtrifluoromethanesulfonate (Sc(OTf)3) is found to be quite effective as a Lewis acid catalyst in the Diels-Alder reaction. The novel catalyst is available in both aqueous and organic media, is easily recovered from aqueous layer after the reaction is completed, and can be reused.
Double-Tandem [4<sub>π</sub>+2<sub>π</sub>]·[2<sub>π</sub>+2<sub>π</sub>]·[4<sub>π</sub>+2<sub>π</sub>]·[2<sub>π</sub>+2<sub>π</sub>] Synthetic Sequence with Photoprotolytic Oxametathesis and Photoepoxidation in the Chromone Series
作者:Roman A. Valiulin、Teresa M. Arisco、Andrei G. Kutateladze
DOI:10.1021/jo102221q
日期:2011.3.4
Chromones are introduced into a double-tandem [4π+2π]·[2π+2π]·[4π+2π]·[2π+2π] synthetic sequence, culminating in photoprotolytic oxametathesis, which leads to an expeditious growth of molecular complexity over a few experimentally simple steps. The overall reaction can potentially be utilized in diversity-oriented synthesis, as it allows for three or more diversity inputs furnishing novel unique polycyclic