Chromium(III)-Catalyzed Addition of Water and Alcohol to α,β-Unsaturated Ketones for the Synthesis of β-Hydroxyl and β-Alkoxyl Ketones in Aqueous Media
An efficient chromium(III) chloride-catalyzed Michael-type reaction of water or alcohol with α,β-unsaturatedketones is developed. A variety of α,β-unsaturatedketones effectively reacted with either water or alcohols to give the corresponding β-hydroxyl ketones or β-alkoxyl ketones in modest to high yields with excellent compatibility to various functional groups. The approach was further utilized
Abstract An efficient method was developed for the conjugate addition of water to various α,β-unsaturatedketones by using bismuth(III) chloride as a catalyst. The reactions proceeded smoothly in the presence of a catalytic amount of BiCl3 (20 mol%) in aqueous media to furnish a variety of synthetically useful β-hydroxyl ketones in moderate to good yields. Apart from water molecule, various alcohols
A vascularization inhibitor containing a compound represented by general formula (I), wherein R₁ represents lower alkyl, alkoxycarbonyl or carboxyl; and R₂, R₃ and R₄ may be the same or different from one another and each represents hydrogen, hydroxy, methoxy or acetoxy. This compound has a significant vascularization inhibitor effect and is useful as a vascularization inhibitor for treating various diseases.
Bi(OTf)<sub>3</sub>-Catalyzed Tandem Meyer–Schuster Rearrangement and 1,4-Addition to the Resulting Vinyl Ketone
作者:Noriko Okamoto、Takuya Sueda、Reiko Yanada
DOI:10.1021/jo5017663
日期:2014.10.17
Bi(OTf)(3)-catalyzed Meyer-Schuster rearrangement of electron-rich propargyl alcohols, followed by 1,4-addition of the resulting vinyl ketone, proceeded smoothly though Meyer-Schuster rearrangement of primary propargyl alcohols is rare. This tandem reaction can be extended to an intramolecular version, featuring a one-pot dihydroquinolone synthesis.