New derivatives of spicamycin modified at the fatty acid moieties of the molecule were synthesized and their structure-activity relationships were examined. The antitumor activity was greatly influenced by modification of the fatty acid moieties to tetradecadienoyl or dodecadienoyl analogues exhibiting better antitumor activity against COL-1 human colon cancer xenograft than SPM VIII.
Highly diastereoselective generation of various 3,3-disubstituted allyl boronates for the stereospecific construction of quaternary centers
作者:Robyn Aryn Biggs、Maria Lambadaris、William W. Ogilvie
DOI:10.1016/j.tetlet.2014.09.038
日期:2014.10
Single isomer trisubstituted olefins were converted into allyl boron nucleophiles that were condensed with aldehydes to give products containing quaternary centers. The products were obtained in extremely high diastereomeric ratios, a reflection of the stereochemical integrity of the starting materials. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.
Triphenylphosphine-Catalyzed Isomerizations of Enynes to (E,E,E)-Trienes: Phenol as a Cocatalyst
作者:Scott D. Rychnovsky、Jinsoo Kim
DOI:10.1021/jo00088a067
日期:1994.5
β-Olefination of 2-Alkynoates Leading to Trisubstituted 1,3-Dienes
作者:Mathias J. Jacobsen、Erik Daa Funder、Jacob R. Cramer、Kurt V. Gothelf
DOI:10.1021/ol2011677
日期:2011.7.1
A phosphine-mediated olefination of 2-alkynoates with aldehydes forming 1,3-dienes with high E-selectivity and up to 88% yield is described. Reaction conditions are optimized and reactions are demonstrated for,various aryl, alkyl, and alkenyl aldehydes and for ethyl 2-alkynoates with different substituents in the delta-position. Proof of concept is shown for the generation of a beta,gamma-unsaturated lactone by intramolecular olefination, and furthermore the use of the generated 1,3-dienes in the Diels-Alder reaction has been demonstrated.
Components of royal jelly
作者:S.A. Barker、A.B. Foster、D.C. Lamb、L.M. Jackman
DOI:10.1016/0040-4020(62)80037-4
日期:1962.1
Chemical and physical evidence is cited which proves that the olefinic linkage in 10-hydroxydec-2-enoic acid, isolated from royaljelly, has the trans-configuration.