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