Catalytic aziridination with alcoholic substrates via a chromium tetracarbene catalyst
نویسندگان
چکیده
منابع مشابه
Catalyst-Controlled Multicomponent Aziridination of Chiral Aldehydes.
A highly diastereoselective and enantioselective method for the multicomponent aziridination of chiral aldehydes has been developed with BOROX catalysts of the VANOL (3,3'-diphenyl-2,2'-bi-1-naphthol) and VAPOL (2,2'-diphenyl-(4-biphenanthrol)) ligands. Very high to perfect catalyst control is observed with most all substrates examined including aldehydes with chiral centers in the α- and β-pos...
متن کاملMulticomponent catalytic asymmetric aziridination of aldehydes.
The first multicomponent catalytic asymmetric aziridination reaction is developed to give aziridine-2-carboxylic esters with very high diastereo- and enantioselectivity from aromatic and aliphatic aldehydes. This new method pushes the boundary of the aziridination reaction to substrates that failed with preformed imines.
متن کاملControlled diastereo- and enantioselection in a catalytic asymmetric aziridination.
Chiral polyborate based Brønsted acids prepared from the VANOL and VAPOL ligands are known to catalyze the reaction of diarylmethyl imines with diazoesters to give cis-aziridines. In the present work, this same catalyst is shown to catalyze the reaction of the same imines with diazoacetamides to give trans-aziridines with the same high asymmetric inductions as seen with cis-aziridines, enabling...
متن کاملEvidence for a boroxinate based Brønsted acid derivative of VAPOL as the active catalyst in the catalytic asymmetric aziridination reaction.
Studies are described that were designed to determine the structure of the active catalyst in the asymmetric catalytic aziridination of imines with ethyl diazoacetate (AZ reaction). Evidence suggests that the active catalyst contains a boroxine ring in which one of the three boron atoms is spiro-fused with the two phenol groups of the VAPOL ligand. (11)B and (1)H NMR evidence supports the borox...
متن کاملOn Catalytic P Systems with One Catalyst
P systems are a computational model introduced by G. Păun in [4]. One of the basic variant considered there was P systems with catalysts and priorities; these systems where shown to be computationally universal. In [2], Sośık and Freund proved that priorities among the rules can be discarded from the model without any loss of computational power. Moreover, it was shown that for extended P syste...
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ژورنال
عنوان ژورنال: Chemical Communications
سال: 2018
ISSN: 1359-7345,1364-548X
DOI: 10.1039/c7cc08928g