One-Step Synthesis of Tertiary α-Amino Ketones and α-Amino Esters From Amines and Diazocarbonyl Compounds
作者:F. G. West、Kevin W. Glaeske、B. N. Naidu
DOI:10.1055/s-1993-25984
日期:——
Diazoketones and diazoesters react with tertiary amines in the presence of copper powder to form transient ammonium ylides. These ylides undergo facile [1,2]-shift from N to C (Stevens rearrangement) of the best migrating group. Overall, α-substituted α-amino ketones or α-amino esters are formed in one step from simple reactants.
The first example of enantioselective base-induced [1,2]-Stevens rearrangement was achieved by using the newly developed D-glucose-derived lithium alkoxide as a chiral promoter. This rearrangement provides an α-amino ketone having a pseudoquaternary chiral center in an enantioenriched form.
Base-catalysed rearrangements involving ylide intermediates. Part 8. The preparation and some reactions of stable ammonium ylides
作者:Robert W. Jemison、Sivapathasuntharam Mageswaran、W. David Ollis、Ian O. Sutherland、Yodhathai Thebtaranonth
DOI:10.1039/p19810001154
日期:——
the reactions of the ammoniumylides resemble those of the corresponding sulphonium ylides. Thus ylides having a suitable migrating group (ArCH2) undergo a Stevens [1,2] rearrangement on heating, and other ylides fragment to give a tertiary amine and products containing the PhCOCH grouping. A number of ylides reacted with dimethyl acetylenedicarboxylate to give the furans (32). The ylides (14b and c)
Base catalysed rearrangements involving ylide intermediates. Part 15. The mechanism of the Stevens [1,2] rearrangement
作者:W. David Ollis、Max Rey、Ian O. Sutherland
DOI:10.1039/p19830001009
日期:——
The Stevens [1,2] rearrangement of acyl-stabilised ammoniumylides has been investigated with regard to stereoselectivity, intramolecularity and the formation of products in addition to the [1,2] rearrangementproduct. A detailed study of the effects of reaction conditions upon the rearrangement of the ylidederivedfrom the salt (13) has shown that the stereoselectivity (retention of the configuration
Photocyclisierung von 3-Aminoketonen zu 2-Amino-cyclopropanolen-(1) und deren Isomerisierung
作者:H. J. Roth、M. H. El Raie、T. Schrauth
DOI:10.1002/ardp.19743070803
日期:——
Die Bestrahlung von 3‐Dialkylaminoketonen, die in Position 1 einen Phenylrest, in 2 oder 3 einen aliphatischen oder aromatischen Rest tragen, führt in hohen Ausbeuten zu 2‐Aminocyclopropanolen‐(1) oder zu stellungsisomeren 2‐Aminoketonen, die durch Valenzisomerisierung der Cyclopropanderivate entstehen.