The reactions of metiloxycarbonylcarbene, which was generated by catalytic thermal decomposition of methyl diazoacetate, with 3-ethyl-2-phenyl- or 2,3-diphenyloxazolidines resulted in the insertion of the former predominantly at the C-N bond of the oxazolidine ring to produce substituted esters of morpholine-3-carboxylic acid.
Rediscovering aminal chemistry: copper(<scp>ii</scp>) catalysed formation under mild conditions
作者:Juliana G. Pereira、João P. M. António、Ricardo Mendonça、Rafael F. A. Gomes、Carlos A. M. Afonso
DOI:10.1039/d0gc01977a
日期:——
aldehyde lithiation. Nevertheless, the existing methodologies for their formation typically employ harsh conditions limiting their usefulness. In this work, we present an efficient and mild methodology for the preparation of aminals from aromatic aldehydes, including furanic platforms. These mildconditions allowed ease of access to a plethora of aminals and as such we set out to explore previously unaccessible
Synthesis of N-(Dialkylaminoalkyl)alcohols by Homogeneously Catalyzed Hydrogenolysis of Cyclic N,O-Acetals
作者:Vitali I. Tararov、Renat Kadyrov、Thomas H. Riermeier、Armin Börner
DOI:10.1055/s-2002-20039
日期:——
The homogeneously catalyzed hydrogenation of 1,3-ox-azolidines affording unsymmetrically substituted 2-N-(dialkylamino)ethanols is reported showing for the first time that Rh(I) catalysts based on chelating diphosphines can be advantageous for this reaction.
Oxazolidines, obtained by the condensation of aldehydes with 2-anilino-1-alkanols, react with the Reformatsky reagent derived from ethylbromoacetate under mild reaction conditions to afford ethyl 3-(2-hydroxyalkyl)aminoalkanoates.
Reaction of phenyl-containing N-substituted 1,3-oxazolidines and 1,3-oxazinanes with triammine(tricarbonyl)chromium
作者:A. N. Artemov、E. V. Sazonova、N. A. Aksenova、G. K. Fukin、A. V. Cherkasov、V. I. Faerman、N. Yu. Grishina
DOI:10.1007/s11172-019-2590-4
日期:2019.8
New heterocyclic compounds with phenyl chromium tricarbonyl substituents were synthesized by the reaction of triammine(tricarbonyl)chromium with phenyl-substituted 1,3-oxazacy-cloalkanes bearing acetyl, tert-butyloxycarbonyl, or phenyl group at the nitrogen atom. The resulting compounds were isolated in the individual state and characterized by physicochemical methods of analysis.