The First Synthesis of Enantiopure α-Amino Ketimines and Amino Aziridines
摘要:
Chiral l-aminoalkyl chloromethyl ketimines 2 are synthesized in enantiomerically pure form starting from l-aminoalkyl chloromethyl ketones 1 and different amines. Reduction of amino ketimines 2 and subsequent spontaneus cyclization affords aminoalkyl aziridines 3 with high diastereoisomeric excess and without detectable racemization.
Synthesis of Enantiopure Imidazolines through a Ritter Reaction of 2-(1-Aminoalkyl)aziridines with Nitriles
作者:José M. Concellón、Estela Riego、José Ramón Suárez、Santiago García-Granda、M. Rosario Díaz
DOI:10.1021/ol048176j
日期:2004.11.1
The Ritter reaction of enantiopure2-(1-aminoalkyl)aziridines 1 with different nitriles afford enantiopure tetrasubstituted imidazolines 2. The opening of the aziridine ring takes place with total regio- and stereoselectivity. A mechanism to explain the described addition reaction is proposed. [reaction: see text]
Stereoselective Functionalization of 2-(1-Aminoalkyl)aziridines via Lithiation of Aziridine-Borane Complexes
作者:José M. Concellón、Pablo L. Bernad、José Ramón Suárez
DOI:10.1002/chem.200500113
日期:2005.7.18
successive formation of aziridine-boranecomplexes, lithiation, treatment with a variety of electrophiles and final decomplexation is described. The influence of the structure of the starting complexes 2 and of the electrophiles in the stereoselectivity of this process has been studied. Finally, successive double lithiation-electrophile reactions were carried out affording enantiopure 1,2,3,3-tetrasubstituted