Radical transformations of some N-alkylanilines by their oxidation with different agents: an EPR study
摘要:
N-Alkylanilines X-NH-Ph (Ph = substituted phenyl ring) with two different types of alkyl substituent X [X = C2H5-CO-CH2CH(Ph), X = CH3, C2H5, CH(CH3)(2), CH2C6H5] were oxidized using different agents. While oxidation with 3-chloroperbenzoic acid leads to production of the corresponding aminoxyl radicals X-NOaEuro cent-Ph, it was confirmed that application of PbO2 resulted in the formation of aminyl radicals X-N-aEuro cent-Ph, as indirectly proved by the spin-trapping method. Contrary to those transformations, with employment of either Pb(OAc)(4) or t-BuO (2) (aEuro cent) radical, reactions taking place on the alkyl substituent were also observed.
Zinc tetrafluoroborate catalyzed Mannich-type reaction of aldimines and silyl enol ethers in aqueous medium
作者:Brindaban C Ranu、Sampak Samanta、Sankar K Guchhait
DOI:10.1016/s0040-4020(01)01177-2
日期:2002.1
The use of zinc tetrafluoroborate as a catalyst in Mannich-type addition of silyl enol ethers to aldimines in aqueous THF provides β-amino ketones or β-amino esters in high yields. A one-pot reaction of an aldehyde, amine and silylenolate also works well.
AbstractA highly anti-diastereoselective three-componentMannichreaction of aromatic amines and aromatic aldehydes with cyclohexanone in the presence of silica-supported ferric hydrogensulfate has been developed. The best selectivity was obtained where there were electron-donating groups on both aldehyde and amine. Selectivity decreases when electron-withdrawing groups are present on the aldehyde;
([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
Diastereoselective Mannich reaction with prolinated MWCNTs as a heterogeneous organo-nanocatalyst
作者:Mahsa Khoshnevis、Hossein Eshghi
DOI:10.1007/s12039-020-1740-4
日期:2020.12
Mannich reaction. The results hold out improvements in stereoselectivity, ease of separating and reusability. Graphic Abstract This work represents an efficient and simple method to prepare Prolinated- MWCNTs as a heterogeneous organo-nanocatalyst. Prolinated-MWCNT was characterized by different analyses. The efficiency and catalytic activity of Pro-MWCNTs have investigated in mannich reaction, which
The Mannich Reaction of Butanone, Aromatic Aldehydes and Aromatic Amines
作者:Yi Lin、Zou Junhua、Lei Huangshu、He Qilin
DOI:10.1080/00397919108019818
日期:1991.10
Abstract Under the catalysis of small amount of concentrated hydrochloric acid, the Mannichreaction of butanone, aromatic aldehydes and aromatic amines can be carried out directly at 0–20°C. Twelve corresponding Mannich bases (1), 1-aryl-1-arylamino-3-pentanones, were prepared in high yields.