Directed 1,3-dipolar cycloadditions of ylidene piperazine-2,5-diones
摘要:
The reactivities and selectivities of 1,3-dipolar cycloaddition reactions of ylidene piperazine-2,5-diones with mesitonitrile oxide are reported. The stereoselectivities of reactions with chiral ylidene piperazine-2,5-diones can be directed by judicious choice of substituents on the N- and/or C-substituents of the piperazinedione ring. (C) 2003 Elsevier Ltd. All rights reserved.
Guidelines for stereocontrolled Diels–Alder reactions of chiral methylidene piperazine-2,5-diones with cyclopentadiene
作者:Brendan A Burkett、Christina L.L Chai
DOI:10.1016/s0040-4039(01)00151-4
日期:2001.3
The reactivities and stereoselectivities of Diels–Aldercycloaddition reactions of methylidene piperazine-2,5-diones with cyclopentadiene can be manipulated by appropriate choice of N- and α-carbon substituents. Good to excellent exo/endo and facialselectivities were obtained.
Methylene piperazine-2,5-diones as templates for the synthesis of amino acid derivatives
作者:Christina L.L. Chai、Alison R. King
DOI:10.1016/0040-4039(95)00743-v
日期:1995.6
Methylene piperazine-2,5-diones 5a and 5b are important synthetic intermediates. The preparation as well as the use of these compounds in the synthesis of amino acid derivatives are described. Our studies demonstrate that excellent chiral induction in carbon-carbon bond forming reactions can be obtained with methylene piperazinedione 5b.
Stereocontrolled intermolecular radical additions to methylidenepiperazine-2,5-diones
作者:Christina L. L. Chai、Alison R. King
DOI:10.1039/a900771g
日期:——
The use of latent amino acid functionalities for the syntheses of methylidenepiperazine-2,5-diones is reported. These piperazinediones are potential chiral templates in the synthesis of functionalised piperazinediones and amino acids. Carbon–carbon bond formation utilising radical addition reactions between the methylidenepiperazinediones and a number of alkyl radicals resulted in good yields of the addition adduct. Moderate to high diastereoselectivities were observed and factors controlling the chiral induction are discussed here.
Directed 1,3-dipolar cycloadditions of ylidene piperazine-2,5-diones
作者:Christina L.L Chai、Alison J Edwards、Bronwyn A Wilkes、Ruth C.J Woodgate
DOI:10.1016/j.tet.2003.09.040
日期:2003.10
The reactivities and selectivities of 1,3-dipolar cycloaddition reactions of ylidene piperazine-2,5-diones with mesitonitrile oxide are reported. The stereoselectivities of reactions with chiral ylidene piperazine-2,5-diones can be directed by judicious choice of substituents on the N- and/or C-substituents of the piperazinedione ring. (C) 2003 Elsevier Ltd. All rights reserved.