A New Route toward 4-Substituted Pyrazino[2,1-<i>b</i>]quinazoline-3,6-dione Systems. Total Synthesis of Glyantrypine
作者:Pilar Cledera、Carmen Avendaño、J. Carlos Menéndez
DOI:10.1021/jo991626e
日期:2000.3.1
Treatment of sodium N-(o-azidobenzoyl)aminoacylglycinates 8 with acetic anhydride afforded 1-acetyl-4-(o-azidobenzoyl)-2,5-piperazinediones 7, with complete retention of the stereochemistry. The intramolecular aza Wittig reactions of compounds 7 in the presence of tributylphosphine followed by deacetylation gave 1,2-unsubstituted pyrazino[2,1-b]quinazoline-3,6-diones 1. This route was adapted to the synthesis of both enantiomers of the alkaloid glyantrypine.
Synthesis and biological evaluation of new biphalin analogues with non-hydrazine linkers
作者:Adriano Mollica、Peg Davis、Shou-Wu Ma、Josephine Lai、Frank Porreca、Victor J. Hruby
DOI:10.1016/j.bmcl.2005.03.067
日期:2005.5
Biphalin is a potent opioid peptide agonist, with a palandromic structure, composed of two enkephalin-like active fragments connected tail to tail by a hydrazine linker (Tyr-D-Ala-Gly-Phe-NH-NH <-Phe <-Gly <-D-Ala <-Tyr). This study presents the synthesis and in vitro bioassays of six new biphalin analogues with three different non-hydrazine linkers, some of which have higher binding affinity and bioactivity than biphalin. (c) 2005 Elsevier Ltd. All rights reserved.