The regioselective ring-opening of N-protected 2-phenylaziridines is accomplished by the addition of organoalanes in dichloromethane. With this simple method it is possible to introduce alkyl, alkenyl and alkynyl substituents at the benzylic position of the phenylaziridine to give the corresponding beta-phenyl-beta-substituted amines, as useful precursors for intramolecular hydroaminations, in high yields. (C) 2009 Elsevier Ltd. All rights reserved.
Nickel-Catalyzed Borylative Ring Opening of Vinyl Epoxides and Aziridines
A mild ring opening of vinyl epoxides and aziridines with B(2)Pin(2) catalyzed by Ni(O)-Binap affords new functionalized allylic boron derivatives which undergo sequential transformations. The uncatalyzed allylation of aldehydes allows obtaining challenging bishomoallylic alicyclic 1,3-diols and 1,3-amino alcohols with remarkably high stereoselectivities. Valuable trans-bisallylic 1,4-amino alcohols can be obtained by a simple oxidation.
Copper-Catalyzed Arylation of Alkenyl Aziridines via Three-Component Coupling Reaction involving Alkynes and Benzyne
Alkenyl aziridines can be successfully arylated in a three-component coupling triggered by in situ generated benzyne with a simple copper catalyst (CuI-PPh3), without the need of any palladium salts. The corresponding allylic amines can be obtained with good to high regioselectivity in mild reaction conditions with a variety of cyclic and acyclic alkenyl aziridines. A new domino reaction with ethyl propiolate to give tetrahydrophenanthridine was also found.
Selective [2+1] aziridination of conjugated dienes with a nitridomanganese complex: a new route to alkenylaziridines
nitridomanganese complex as a nitrogen source. The reaction proceeded selectively and in good yield via [2+1] addition to give alkenylaziridines, with no evidence for the formation of any [4+1] addition products. The first asymmetric version of the reaction was revealed in the aziridination of diene 5 with chiral complex 1.
Synthesis and reactions of cyclopentadiene monoaziridine: a concise approach to the core of agelastatin A
作者:Elise Baron、Peter O'Brien、Timothy D Towers
DOI:10.1016/s0040-4039(01)02238-9
日期:2002.1
protocol for the preparation of cyclopentadiene monoaziridine is described (88% yield). The utility of cyclopentadiene monoaziridine is demonstrated by its use in (i) the shortest synthetic entry into 4-amino substituted cyclopentenes and (ii) the preparation of two key intermediates in a concise synthetic approach to the cyclopentane core of agelastatin A. The agelastatin A model studies make use of a