New enolate-carbodiimide rearrangement in the concise synthesis of 6-amino-2,3-dihydro-4-pyridinones from homoallylamines
作者:N. Yu. Kuznetsov、R. M. Tikhov、I. A. Godovikov、V. N. Khrustalev、Yu. N. Bubnov
DOI:10.1039/c6ob00293e
日期:——
Three-step synthesis of 6-amino-2,3-dihydro-4-pyridinones from homoallylamines involving NBS (or I2, PhSeCl)-mediated cyclization of N-(3-butenyl)ureas to 6-(bromomethyl)-2-iminourethanes, dehydrohalogenation and the novel enolate-carbodiimide rearrangement as a key step has been developed. The...
One-pot five-component reactions of oxathiazolidine-S-oxides with mesitylmagnesiumbromide, lithium bis(trimethylsilyl)amide, aldehydes and Grignard reagents afford chiral nonracemic amines or sulfinamides in good yields and high stereoselectivities.
Adducts of Triallylborane with Ammonia and Aliphatic Amines as Stoichiometric Allylating Agents for Aminoallylation Reaction of Carbonyl Compounds
作者:Nikolai Yu. Kuznetsov、Rabdan M. Tikhov、Tatiana V. Strelkova、Yuri N. Bubnov
DOI:10.1021/acs.orglett.8b01317
日期:2018.6.15
Triallylborane–amines adducts are effective stoichiometric allylating agents in the aminoallylation reaction of carbonyl compounds in methanol. Moreover, copper-catalyzed diastereoselective allylation of Ellman’s imine was achieved with triallylborane–methylamine adduct.
2,2- and 2,6-Diarylpiperidines by Aryl Migration within Lithiated Urea Derivatives of Tetrahydropyridines
作者:Michael B. Tait、Sam Butterworth、Jonathan Clayden
DOI:10.1021/acs.orglett.5b00199
日期:2015.3.6
or carbolithiation led to migration of the N′-aryl substituent to the 2- or 6-position via intramolecular nucleophilic attack of a benzylic organolithium on the aryl ring. The products are a range of 2,2-, 2,2,3-, and 2,6-polysubstituted piperidine derivatives. Related chemistry was observed in pyrroline homologues.
Homoallylic amines as efficient chiral inducing frameworks in the conjugate addition of amides to α,β-unsaturated esters. An entry to enantio-enriched diversely substituted amines
The diastereoselective conjugateaddition of secondary homoallylamines, obtained in the enantioenriched form via allylmetallation of imines, to α,β-unsaturated esters is reported. This method allows access to valuable building blocks as well as heterocyclic skeletons, providing tertiary amines bearing two chains integrating a stereogenic center adjacent to the nitrogen atom.