Novel Domino Oxidative Coupling: C−C Bond Formation Sequence to Highly Functionalized Dibenzo[<i>a</i>,<i>c</i>]cycloheptenes
作者:Kristina Hackeloer、Gregor Schnakenburg、Siegfried R. Waldvogel
DOI:10.1021/ol102969k
日期:2011.3.4
A domino sequence involving various MoCl5-mediated oxidations followed by trapping and supposed [3,3]-sigmatropic rearrangement provides a fast access to the full carbon skeleton of metasequirin-B. A variety of different moieties R1 and R2 are tolerated.
Cycloheptatriene and tropylium metal complexes. Part IV. Preparation of 7-exo-substituted tricarbonylcycloheptatrienechromiums
作者:P. L. Pauson、G. H. Smith、J. H. Valentine
DOI:10.1039/j39670001057
日期:——
The 7-exo-configuration is assigned to all substituted tricarbonylcycloheptatrienechromiums previously prepared by the “normal” reaction of tricarbonyltropyliumchromium salts with anions. Several new examples are described, and displacement of methoxide from tricarbonyl-7-exo-methoxycycloheptatrienechromium is shown to be an advantageous alternative route to these products.
Cycloheptatriene and tropylium metal complexes. Part V. 7-endo-Substituted tricarbonylcycloheptatrienechromiums
作者:P. L. Pauson、G. H. Smith、J. H. Valentine
DOI:10.1039/j39670001061
日期:——
Reaction of 7-substituted cycloheptatrienes with either hexacarbonylchromium or with tricarbonyltripyridine-chromium leads to the corresponding 7-endo-substituted tricarbonylcycloheptatrienechromiums, either exclusively or, in only two of the cases studied, mixed with the exo-isomer. Some new observations on the ring-contraction of such complexes are reported.