Synthesis of (±)-Amathaspiramide F and Discovery of an Unusual Stereocontrolling Element for the [2,3]-Stevens Rearrangement
作者:Arash Soheili、Uttam K. Tambar
DOI:10.1021/ol4025937
日期:2013.10.4
A formal total synthesis of (+/-)-amathaspiramide F through a tandem palladium-catalyzed allylic amination/[2,3]-Stevens rearrangement is reported. The unexpected diastereoselectivity of the [2,3]-Stevens rearrangement was controlled by the substitution patterns of an aromatic ring. This discovery represents a new stereocontrolling element for [2,3]-sigmatropic rearrangements in complex molecular settings.
Discovery of S1P agonists with a dihydronaphthalene scaffold
Structure-activity relationship of sphingosine-1-phosphate receptor agonists was examined. Cinnamyl derivative 1 was modified to improve S1P(1) agonistic activity as well as selectivity over S1P(3) agonistic activity. Dihydronaphthalene derivative 10d was identified as a potent S1P(1) receptor agonist with high selectivity against S1P(3) and enhanced efficacy in lowering peripheral lymphocyte counts in mice. (C) 2011 Elsevier Ltd. All rights reserved.