Synthesis of 6,8-Diazabicyclo[3.2.2]nonanes: Conformationally Restricted Piperazine Derivatives
摘要:
Starting with the proteinogenic amino acid (S)-glutamate, a general method for the synthesis of 3-(piperazin-2-yl)propionic acid esters 7 with various substituents at N-4 of the piperazine ring system is presented. An intramolecular ester condensation of 7 is the key step in the formation of the 6,8-diazabicyclo[3.2.2]nonane derivatives 8-10, which are of interest as conformationally restricted piperazines.
Synthesis of bridged piperazines with σ receptor affinity
作者:Manuela Weigl、Bernhard Wünsch
DOI:10.1016/j.ejmech.2007.02.005
日期:2007.10
from (S)-glutamate, which was transformed in five reaction steps into the piperazinediones 5 bearing a propionic acid ester side chain. A two-step Dieckmann analogous cyclization provided the bicyclic ketones 7 as key intermediates. The alcohols 8 were prepared by LiAlH4 reduction of the ketones 7. NaBH4 reduction, Williamson ether synthesis and LiAlH4 reduction led to the methyl and benzyl ethers 12
Synthesis of 6,8-Diazabicyclo[3.2.2]nonanes: Conformationally Restricted Piperazine Derivatives
作者:Manuela Weigl、Bernhard Wünsch
DOI:10.1021/ol990393a
日期:2000.5.1
Starting with the proteinogenic amino acid (S)-glutamate, a general method for the synthesis of 3-(piperazin-2-yl)propionic acid esters 7 with various substituents at N-4 of the piperazine ring system is presented. An intramolecular ester condensation of 7 is the key step in the formation of the 6,8-diazabicyclo[3.2.2]nonane derivatives 8-10, which are of interest as conformationally restricted piperazines.