Diastereodivergent Hydroxyfluorination of Cyclic and Acyclic Allylic Amines: Synthesis of 4-Deoxy-4-fluorophytosphingosines
作者:Alexander J. Cresswell、Stephen G. Davies、James A. Lee、Melloney J. Morris、Paul M. Roberts、James E. Thomson
DOI:10.1021/jo301056r
日期:2012.9.7
ammonium ion. Regioselective and stereospecificepoxide ring-opening by transfer of fluoride from a BF4– ion (an SN2-type process at the carbon atom distal to the ammonium moiety) then occurs in situ to give the corresponding amino fluorohydrin. Alternatively, an analogous reaction using 20 equiv of HBF4·OEt2 results in preferential epoxidation of the opposite face of the olefin, which is followed by regioselective
Sphingosine kinases (SphKs) are oncogenic enzymes that regulate the critical balance between ceramide and sphingosine-1-phosphate. Much effort has been dedicated to develop inhibitors against these enzymes. Naturally occurring pachastrissamine (jaspine B) and all its stereoisomers were prepared and evaluated for their inhibitory effects against SphKs. All eight stereoisomers exhibited moderate to potent inhibitory activity against SphK1 and SphK2. Inhibitory effects were profiled against protein kinase C (PKC) isoforms by in vitro experiments. Atypical PKCs (PKC zeta and PKC iota) were inhibited by several pachastrissamine stereoisomers. The improved activity over N,N-dimethylsphingosine suggests that the cyclic scaffold in pachastrissamines facilitates potential favorable interactions with SphKs and PKCs. (C) 2011 Elsevier Ltd. All rights reserved.
METHOD OF TREATING OVARIAN CANCER USING A PKC INHIBITOR
申请人:Acevedo-Duncan Mildred Enid
公开号:US20150366883A1
公开(公告)日:2015-12-24
A method of treating ovarian cancer by administering a PKC inhibitor is presented herein. It was found that administering a PKC inhibitor, such as ACPD or ICA-1, to ovarian cancer cells inhibited cancer cell proliferation.
US9301965B2
申请人:——
公开号:US9301965B2
公开(公告)日:2016-04-05
Synthesis of pachastrissamine (jaspine B) and its derivatives by the late-stage introduction of the C-2 alkyl side-chains using olefin cross metathesis
An improved divergent synthesis of the four diastereomers of pachastrissamine from Garner's aldehyde has been reported. The common intermediate was synthesized by an indium-mediated acetoxyallylation reaction. The long alkyl sidechain was introduced in the late stage of the synthesis using an olefin cross metathesis reaction. Biologicalevaluation of the chain modified analogs of the (2S,3S,4R)-isomer