Three-Component Synthesis of Amine Derivatives Using Benzylic and Allylic Alcohols as<i>N</i>-Alkylating Agents in the Absence of External Catalysts and Additives
作者:Hai-Hua Li、De-Jun Dong、Shi-Kai Tian
DOI:10.1002/ejoc.200800465
日期:2008.7
The direct employment of benzylic and allylic alcohols as N-alkylating agents provides a useful synthetic route for amine derivatives by avoiding the preactivation of the hydroxygroups of alcohols. Herein we report a novel by-product-catalyzed three-component synthesis of amine derivatives from readily available benzylic and allylic alcohols, acyl chlorides (chloroformates or sulfonyl chlorides),
Reactions between various benzyl alcohols or tert-butyl alcohol and nitriles were carried out in the presence of catalytic amounts (usually 10–20 mol-%) of o-benzenedisulfonimide as a Bronsted acidcatalyst; the reaction conditions were mild and the yields of amides were good. The catalyst was easily recovered and purified, ready to be used in further reactions, with economic and ecological advantages
Air-stable Bis(pentamethylcyclopentadienyl) Zirconium Perfluorooctanesulfonate as an Efficient and Recyclable Catalyst for the Synthesis of N-substituted Amides
Bis(pentamethylcyclopentadienyl) zirconium perfluorooctanesulfonate is an air‐stable and water‐tolerant Lewis acid. This complex exhibited good thermal stability and high solubility in polar organic solvents. The compound showed relatively strong acidity, with an acid strength of 0.8
An efficient solvent-free synthesis of amides by Ca(II) catalyzed Ritterreaction has been reported under microwave irradiation. This green protocol tolerates the substrate diversity and delivers the high yielding amides with minimal loading of inexpensive and more abundant Ca(II) catalyst.
Bis-Sulfamyl Imines: Potent Substrates for Asymmetric Additions of Arylboroxines under Rhodium Catalysis
作者:Rosemary Crampton、Simon Woodward、Martin Fox
DOI:10.1002/adsc.201000838
日期:2011.4.18
Bis‐sulfamyl imines are shown to be potentially ideal substrates for rhodium‐catalysed asymmetricadditions of arylboron nucleophiles as they show: (i) near perfect enantioselectivities (11 examples, 98–99+% ee), (ii) good to excellent diastereoselectivities (10–32:1 rac:meso), and (iii) high functional group tolerance in removal of the low molecular weight protecting group via mild heating in aqueous