An enantioselective total synthesis of natural antibiotic marasin
作者:Yan Zhang、Yikang Wu
DOI:10.1039/c0ob00151a
日期:——
Synthetic studies directed toward the allenediyne antibiotic marasin are presented. Different approaches to the installation of the optically active chiral allenediyne motif were explored en route to the synthesis of the natural product. The stereoselectivity for the construction of the chiral allenediyne motif was dependent on not only the reaction employed but also the substrate structure.
作者:Rosenthal, Uwe、Ohff, Andreas、Baumann, Wolfgang、Kempe, Rhett、Tillack, Annegret、Burlakov, Vladimir V.
DOI:——
日期:——
Hydrogenating an organometallic carbon chain: buten-yn-diyl (CHCHCC) as a missing link
作者:Michael J. Bartlett、Benjamin J. Frogley、Anthony F. Hill、Manab Sharma、Matthew K. Smith、Jas S. Ward
DOI:10.1039/c9dt03229k
日期:——
The sequential reaction of [Ru(CCCCH)Cl(CO)2(PPh3)2] with [Ru(CO)2(PPh3)3], and N-chlorosuccinimide affords the binuclear tetracarbido complex [Ru2(μ-CCCC)Cl2(CO)4(PPh3)4]. This may be compared with the first example of a butenyndiyl bridged bimetallic complex [Ru2(μ-CHCHCC)Cl2(CO)4(PPh3)4] which is obtainedfrom the reaction of [Ru(CCCCH)Cl(CO)2(PPh3)2] with [RuHCl(CO)(PPh3)3] followed by carbonylation
Reactivity differences between 2,4- and 2,5-disubstituted zirconacyclopentadienes: a highly selective and general approach to 2,4-disubstituted phospholes
作者:Guillaume Bousrez、Florian Jaroschik、Agathe Martinez、Dominique Harakat、Emmanuel Nicolas、Xavier F. Le Goff、Jan Szymoniak
DOI:10.1039/c3dt51158h
日期:——
Cp2ZrCl2/lanthanum system. Reactions of dihalophosphines with these mixtures afforded selectively the corresponding 2,4-disubstituted phospholes and 1,4-disubstituted butadienes. A new series of phospholes was characterized by multi-nuclear NMR spectroscopy and X-ray analysis. A possible explanation for the observed selectivity was obtained from X-ray studies and DFT analysis of the intermediate zirconacyclopentadienes