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.