Aerobic intramolecular aminothiocyanation of unactivatedalkenes has been developed by in situ generated iodine thiocyanate under open-flask conditions. This protocol provides a concise and efficient method for synthesizing SCN-containing pyrrolidine, piperidine and indoline derivatives with isolated yields of up to 87%. Furthermore, mixing iodine and sodium thiocyanate with oxygen afforded iodine
A Bifunctional Pd/MgO Solid Catalyst for the One-Pot Selective N-Monoalkylation of Amines with Alcohols
作者:Avelino Corma、Tania Ródenas、MarÃaâ J. Sabater
DOI:10.1002/chem.200901501
日期:2010.1.4
the selective monoalkylation of amines with alcohols. The reaction goes through a series of consecutive steps in a cascade mode that involves: 1) the abstraction of hydrogen from the alcohol that produces the metal hydride and the carbonyl compound; 2) condensation of the carbonyl with the amine to give an imine, and 3) hydrogenation of the imine with the surface hydrogen atoms from the metal hydride
A nickel-catalyzed aminofluoroalkylative cyclization of unactive alkenes with iododifluoromethyl ketones was developed to construct versatile difluoroalkylated Nitrogen-containing heterocycles including aziridines, pyrrolidines and piperidines in moderate to high yields. This method features a broad substrate scope and has been demonstrated on gram scale.
bicyclic core structures with up to three stereocenters within a single step. Herein, this concept is combined with the chemistry of chiral Brønsted acid bound ortho-quinonemethideimines to generate a range of interesting fused tetrahydroquinolines in a diastereo- and enantioselective manner.
The scope of the palladium-catalyzed carboamination reaction for the synthesis of 2-substituted pyrrolidines, piperidines, and morpholines was investigated. Formation of a 2,4-disubstituted pyrrolidine proceeded in high yield but with a diastereoisomeric ratio of only 2:5, favoring the cis-isomer. The diastereoselectivity is hence significantly smaller than that observed previously in the formation