Synthesis of Highly Functionalized Anthraquinones and Evaluation of Their Antitumor Activity
作者:Lutz F. Tietze、Kersten M. Gericke、Ingrid Schuberth
DOI:10.1002/ejoc.200700418
日期:2007.9
Highlyfunctionalizedanthraquinones which derive from the natural products mensacarcin, islandicin, and chrysophanol have been efficiently synthesized using a Diels–Alder reaction as key step. The introduction of the proposed pharmacophoric side chain unit has been achieved by an addition of an aryllithium species onto different aldehydes. Furthermore, the antitumoractivity of these novel compounds
Reactions of ketene acetals-14 The use of simple mixed vinylketene acetals in the annulation of quinones
作者:Jacques Savard、Paul Brassard
DOI:10.1016/s0040-4020(01)91496-6
日期:1984.1
α,β- β, γ-unsaturated esters can be converted by strong base and chlorotrimethylsilane to the corresponding mixed vinylketene acetals which are shown to be particularly useful and generally applicable reagents for the regiospecific annulation of halogenoquinones. The reaction proceeds readily with a variety of substrates including benzoquinones.
Total Synthesis and Stereochemical Reassignment of (+)-Dolastatin 19
作者:Ian Paterson、Alison D. Findlay、Gordon J. Florence
DOI:10.1021/ol060609q
日期:2006.5.1
configurational assignment for the cytotoxic marine macrolide dolastatin 19 is proposed and validated by total synthesis. Key features of the route include an asymmetric vinylogous aldol reaction to install the isolated C13 stereocenter and (E)-trisubstituted alkene, two sequential 1,4-syn boron-mediated aldol reactions, and a Mukaiyama glycosylation to append the l-rhamnose-derived pyranoside.
Total synthesis and stereochemical reassignment of (+)-dolastatin 19, a cytotoxic marine macrolide isolated from Dolabella auricularia
作者:Ian Paterson、Alison D. Findlay、Gordon J. Florence
DOI:10.1016/j.tet.2007.01.048
日期:2007.6
the cytotoxic marine macrolide dolastatin 19 is proposed, together with its validation by completion of the first total synthesis. Key features of the highly stereocontrolled route include an asymmetric vinylogous Mukaiyama aldol reaction to simultaneously install both the remote C13 stereocenter and the C10–C11 (E)-trisubstituted olefin, two sequential 1,4-syn boron-mediated aldol reactions, and a late-stage
Total Synthesis of the Proposed Structure of the Anthrapyran Metabolite δ-Indomycinone
作者:Lutz F. Tietze、Ramakrishna Reddy Singidi、Kersten M. Gericke
DOI:10.1002/chem.200700823
日期:——
diastereoselective alkylation of enantiomerically pure dioxolanone 8. The reported synthetic approach has the advantage of high yields, excellent selectivity and a remarkable general applicability for the total synthesis of other anthrapyran natural products. The spectroscopic data obtained for the synthetic compounds 2 and 36 are not in agreement with those reported for the natural product, and therefore