Clay catalyzed rearrangement of substituted allyl phenyl ethers: Synthesis of ortho-allyl phenols, chromans and coumarans
作者:William G. Dauben、Jeffrey M. Cogen、Victor Behar
DOI:10.1016/s0040-4039(00)89033-4
日期:1990.1
Montmorillonite clays catalyze the rearrangement of substituted allyl phenyl ethers to provide ortho-allyl phenols, chromans and coumarans under mild conditions.
Indium triflate catalysed tandem allylation–intramolecular hydroalkoxylation was efficiently carried out by using 1 mol-% of the catalyst under mild conditions to afford the dihydrobenzopyran ring system (chroman-type structure) in good yields. Kinetic, mechanistic and theoretical studies are also presented.
Synthesis of Chromans via [3 + 3] Cyclocoupling of Phenols with Allylic Alcohols Using a Mo/<i>o</i>-Chloranil Catalyst System
作者:Yoshihiko Yamamoto、Kouhei Itonaga
DOI:10.1021/ol802800s
日期:2009.2.5
The combination of a molybdenum complex (CpMoCl(CO)(3) or [CpMo(CO)(3)](2)) and o-chloranil was used as a catalyst in the [3 + 3] cyclocoupling of phenols and allylic alcohols under microwave heating conditions. Substituted chromans were selectively obtained in moderate to good isolated yields.
ARYLSULPHONYL-NITROMETHANES, PROCESS FOR THEIR PREPARATION AND PHARMACEUTICAL COMPOSITIONS