The preparation of ketone constituents from Echinacea pallida
作者:George A. Kraus、Feng Liu
DOI:10.1016/j.tet.2011.08.031
日期:2011.10
Efficient syntheses of two ketonesfrom Echinacea pallida are described.
描述了来自紫锥菊的两种酮的有效合成。
Synthesis and aromatisation of cyclic enediyne-containing amino acids
作者:Jasper Kaiser、Bart C. J. van Esseveldt、Margot J. A. Segers、Floris L. van Delft、Jan M. M. Smits、Sam Butterworth、Floris P. J. T. Rutjes
DOI:10.1039/b815176h
日期:——
A series of cyclic enediyne-containing amino acids with ring sizes varying from 10 to 12 atoms have been prepared starting from propargylglycine and homopropargylglycine. Their reactivity towards Bergman cyclisation under elevated temperatures has been explored. The enediynes displayed marked differences in cyclisation half-lives depending on the olefinic substituent and the ring size. A potential candidate for incorporation into peptides has been identified.
cycloaromatization reactions of 10-membered enediynes containing a sulfone or a sulfoxide moiety are described. These enediynes cycloaromatized smoothly under physiological conditions to generate bioactive α,3-didehydrotoluene biradicals, that showed potent DNA damaging abilities. Further, in the presence of a nucleophile such as amine or sulfide, cycloaromatization did not occur following the radical reaction pathway