A water-soluble Brønstedacid, 5-sulfosalicylic acid, efficiently catalyzed the direct three-component Mannich reactions of cyclohexanone and 3-pentanone in pure water. 21 Examples of Mannich reactions were presented, which afforded the corresponding β-amino ketones with up to 97% yield and decent diastereoselectivities. The acid catalyst can be recycled as an aqueous solution for at least six times
Ultrasound-assisted rapid synthesis of β-aminoketones with direct-type catalytic Mannich reaction using bismuth(III) triflate in aqueous media at room temperature
作者:S. Ozturkcan、Kadir Turhan、Zuhal Turgut
DOI:10.2478/s11696-011-0097-z
日期:2012.1.1
to synthesise various β-aminoketone derivatives from cyclohexanone, substituted aromatic amines and aromatic or hetero-aromatic aldehydes via ultrasound-assisted direct-type catalytic Mannichreactionusing bismuth(III) triflate in water. Good yields of the desired β-aminoketones were obtained at room temperature by ultrasound-assisted reaction within 1–2 h. The major advantages of the proposed method
A Yb(OTf)3/PEG-Supported Quaternary Ammonium Salt Catalyst System for a Three-Component Mannich-Type Reaction in Aqueous Media
作者:Xu-Feng Lin、Deng Hong、Yun-Yun Yang、Yan-Guang Wang
DOI:10.1055/s-0028-1088221
日期:2009.4
A one-pot, three-component Mannich reaction of cyclohexanone with aromatic aldehyde and aromatic amine was efficiently catalyzed by Yb(OTf)3/PEG-supported quaternary ammonium salt system in water at room temperature. This reaction afforded the corresponding β-amino carbonyl compounds in good yields with high anti selectivity, and the catalyst system was recyclable.
heterogeneous catalyst for the Mannich reaction. One-pot multi-component condensation of an aldehyde, an amine and a ketone at ambient temperature affords the corresponding β-amino ketones using novel nano-sized Rb2HPW12O40. Simple purification, short reaction time and high yield are some of the advantages of this reaction. Also, the catalyst can be readily isolated. The nano catalyst Rb2HPW12O40 has
([bmim][PF₆]), catalyzed, one-pot three-componentMannichreaction has been carried out to synthesize β-amino carbonyl compounds at room temperature. The reaction afforded desired products in excellent yields with moderate to good diastereoselectivity. The method provides a novel modification of three-componentMannichreaction in terms of mild reaction conditions, clean reaction profiles, low amount of catalyst