arenes and 2,2-dimethylchromans using a Friedel–Crafts-type coupling between activated arenes and isoprene is reported. A combination of catalytic amounts of FeCl3 and AgBF4 promotes a regioselective prenylation event followed by a cyclization to form a 2,2-dimethylchroman structure. The method avoids isoprene polymerization and allows the facile late-stage derivatization of biologically active motifs.
AHLUWALIA, V. K.;BALA, S., ACTA CHIM. HUNG., 1983, 113, N 2, 143-148
作者:AHLUWALIA, V. K.、BALA, S.
DOI:——
日期:——
Reusable Scandium/Ionic Liquid Catalyst System for Sequential C-C and C-O Bond Formations between Phenols and Dienes with Atom Economy
作者:So Youn
DOI:10.1055/s-2007-990963
日期:2007.12
Mild, efficient, and atom economical sequential C-C/C-Obondformationsbetweenphenols and dienes using the reusable catalyst system, Sc(OTf) 3 -[bmim][PF 6 ], have been developed to afford in good yields a variety of dihydrobenzopyran and dihydrobenzofuran ring systems, which are important motifs in both naturally occurring and biologically active compounds. In these reactions the ionic liquid acts