Natural granaticin (1) has been synthesized by joining the chiral left and right fragments, (5) and (10), and subsequent lactonization of the resulting product (11) and oxidative O-demethylation.
Studies related to the use of fused bipyranoses for synthesis of polypropionate arrays
作者:David R. Mootoo、Bert Fraser-Reid
DOI:10.1016/0008-6215(88)85084-5
日期:1988.3
( aldehydo ) group be liberated and then reduced to CH 3 . The bipyranose 4a has been examined in this context. Standard mercaptolysis reactions were ineffective due, in part, to the ease with which acid-catalyzed rearrangements occur. Even when the bicyclicsystem could be cleaved, hemiacetals [ e.g. , 1,5-di- O -acetyl-3- O -benzyl-2-deoxy-4- C -methyl-2- C -( l - lyxo -2,3,4-triacetoxy-1-benzyloxybutyl)-α
Dibenzoheterocyclic hydroxamic acids and hydroxy ureas as inhibitors of
申请人:Merck & Co., Inc.
公开号:US05036067A1
公开(公告)日:1991-07-30
Compounds having the formula I: ##STR1## are inhibitors of the 5-lipoxygenase enzyme. These compounds are useful as anti-asthmatic, anti-allergic, anti-inflammatory, and cytoprotective agents. They are also useful in treating diarrhea, hypertension, angina, platelet aggregation, cerebral spasm, premature labor, spontaneous abortion, dysmenorrhea, and migraine.
Synthesis of (−)-11-<i>O</i>-Debenzoyltashironin: Neurotrophic Sesquiterpenes Cause Hyperexcitation
作者:Masaki Ohtawa、Michael J. Krambis、Rok Cerne、Jeffrey M. Schkeryantz、Jeffrey M. Witkin、Ryan A. Shenvi
DOI:10.1021/jacs.7b04206
日期:2017.7.19
neurotrophic sesquiterpenes, trace plant metabolites that enhance neurite outgrowth in cultured neurons. We report its synthesis in six steps from a butenolide heterodimer via its likely biosynthetic precursor, 3,6-dideoxy-10-hydroxypseudoanisatin, here identified as the chain tautomer of 1. Access to the tashironin chemotype fills a gap in a comparison set of convulsive and neurotrophic sesquiterpenes, which